MADE IN SWEDEN

FX IMPACT M4 OWNER’S MANUAL

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FX Impact M4
1 2 3 4 5 6 7 8

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

1. Pellet Probe Mount 21. Recoil Pad 29. Grip

2. Barrel Breech 22. Recoil Pad Fastener 30. Safety
3. Barrel Fastener 23. Magazine Slot 31. Bottle Pressure Gauge
4. Right Sidelever Mount 24. Magazine 32. Quick Connector Male
5. Angled Gauge Mount (Optional Accessory) 25. Magazine Release 33. Quick Connector Female
6. Sidelever (Reversable) 26. Regulator Pressure Gauge 34. Dust Cover
7. Scope Rail 27. Power Plenum 750 35. Fore-end Accessory Rail
8. Right Accessory Rail 28. Grip Fastener

40 41 42 43 44 45

50 51 53 55 56 57 58 59

40. Barrel 45. Cheek Piece 55. Accessory connection for gauge
41. Left Accessory Rail 50. Muzzle Thread Cap 56. Trigger Guard
42. Valve Adjuster 51. Air Pressure Tank 57. Trigger
43. Micro Power Adjuster (Fine Tune Barrel Roller) 53. Bottle connector 58. Regulator
44. Left Sidelever Mount 59. Rear Macro Power Adjuster (Hammer Power Wheel)
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Welcome Warnings
Congratulations to your new high-end precision tool and welcome to the • Never attempt to disassemble this rifle!
FX family! Please read and follow this manual thoroughly. • Never fire the rifle when it is empty of air or when air cylinder is removed!
• Never point the rifle at anyone, or allow anyone to point a rifle at you!
• Treat every rifle as if it is loaded even if you know it is not loaded!
• Always carry the rifle so that the direction of the muzzle is under control,
even if you stumble.
• Always be sure of your target and what lies behind it before firing your rifle.
• Never leave a loaded rifle unattended.
• Beware of targets that tend to cause ricochets.
• It is recommended that eye protection is worn.
• Always use caution when operating this rifle.
• Learn and obey the laws in your location.
• Be responsible in your use of this rifle!
• Never fill the rifle with anything else other than regular air!
• Never fire the rifle below set regulator pressure.
• If equipped with a carbon-fiber air tank: inspect according to the
instructions on the tank.
• Failure to obey these instructions could result in personal injury or
damage to the gun!
Page
• Never leave the rifle with ammunition in the bore/barrel.

1 Warnings 5
2 Safety Operation 5
3 Handling (cocking and uncocking) 6
4 Gear up 7
5 Pressurize 8
6 Load magazine 10
7 Use your airgun 11 Safety Operations
8 Adjustments 18 This gun uses a switch style safety that is very easy to operate (30).
9 Alternations 23 Safe Not possible to fire the gun.
Fire You are able to fire the gun.
10 Accessory options 27
Keep the gun in safe mode when you do not intend to fire.
11 Miscellaneous 27
Note Never point the rifle at anyone even if it is set to “safe”.

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3 Handling 4 Gear Up
3.1 Cocking the rifle This particular gun is equipped with a total of four picatinny style rail’s
for both scope and accessories.
Prepare the rifle for use by learning how to operate the sidelever cocking system.
4.1 Dual rail system (7)
Pulling rearward on the cocking lever (6) engages the trigger and hammer
simultaneously. Mount your optics according to the optics manual but wait with zeroing
until you have gone thru all steps of the manual.
Set the safety (30) to the “Safe” position and pull the sidelever rearwards.
The rail is of pica-tinny style and it’s possible to adjust the rail position on
A distinguished click in the most rearward position is the indication of a
the gun.
successful cocking.
It is also removable and beneath it you find a 9-11 dove tail rail for easy
Move the sidelever forward and make sure it is completely closed,
fitting of dove-tail applications.
your gun is ready to be fired if safety is set to “Fire”.
To adjust or remove: loosen screw 7.a and slide to preferred position or
It is preferable to store the gun un-cocked so next step is to learn how
slide all the way back to remove.
to un-cock.
When refitting or in position: Tighten the screws to correct torque.
3.2 Uncocking the rifle/inactivate trigger system
Note: to obtain accuracy it’s crucial that you tighten the screw down to
Pull the cocking lever (6) to its rear position, put the safety (30) to Fire. correct torque (2Nm)
Hold one hand on the cocking lever and then with the other hand you squeeze 4.2 Accessory rails (8 and 41)
the trigger (57) and simultaneously gently move the cocking lever forward.
One at each side for accessories such as lamps, lasers etc.
This will release the trigger and hammer-spring tension. 4.3 Fore-end rail (35)
The fore-end rail is suitable for bipods and other accessories.
For Left hand shooters

This rifle is equipped with an ambidextrous sidelever mount, see section 9.3. 7a 7a 7a 7a

It comes mounted for right hand use but can easily be repositioned on the left
side for left hand shooters.

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5 Pressurize 5.2 Pressurize

5.1 Preparation Max overall pressure in system

Singel regulator setup = 250 BAR (more info found in section 8).
One 1/8” threaded quick connector (33) is supplied with the rifle, this can be
Dual regulator setup = 300 BAR (more info found in section 8).
attached to the most common charging sources on the market.
Max air reservoir pressure: See markings on air reservoir.
NOTICE – Make sure that the thread is the same at the charging source
before you attach the connector. Remove dust-cap (34) Close ventilation screw on the charging source.

Attach the connector to the source and make sure it seals. Push the quick connector over the male connector on the gun (32)

One seal is included and attached to the connector and is sufficient in most cases. Charge the rifle to wanted pressure without exceeding maximum pressure limit
of air reservoir or main block.
Make sure to follow manual for the connected charging source.
You read the filling pressure on the main pressure gauge (31).

Also check the pressure on the charging source, they have in some case a
more reliable gauge.

The gauges on the gun are indicators and not 100% accurate.

When you are ready with the fill you drain/bleed hose pressure on the charging
source and simply release the quick connector by pulling the sleeve.

Put the dust cover back in place and you are ready.

Recharge as soon as you come to the point when tank pressure (31) is just
above regulator

Output pressure (26) Do not use the gun if tank pressure is below set
regulator pressure.

WARNING Only dry air should be used! Under no circumstances should

Oxygen or any other gas be used to fill the air-tubes! This might result in
serious injury or death!

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6 Magazine 7 How to use
How to load the Side-Shot magazine (24) 7.1 Inserting magazine
Turn the lid-lock (1) to the position (open) where you are able to remove the lid (2). Prepare the rifle for use by pulling rearward on the cocking lever (6) until it
clicks in the rearward position.
Turn the pellet tray (3) counterclockwise until you hit the stop.
Set the safety (30) to “Safe” position.
Put a pellet into the first position (4) head first while holding your finger under
the hole to stop it, let go of the pellet tray as the pellet you inserted will lock Barrel breech (2) has a protruding edge which match the slot in the magazine (24).
and prevent the pellet tray from rotating. Carefully insert the magazine in the magazine slot (23).
Insert the rest of the pellets head first, make certain all the pellets fall in Press firmly to ensure the magazine is completely installed.
correctly into their slots (5).
You will hear a click when the locking mechanism (25) locks in position.
Once the magazine has been filled, put the lid back into position and turn the
Closing the cocking lever will now load a pellet into the barrel and make the
lid-lock until it is the opposite position of the cutout (locked).
rifle cocked and ready for use.
Our guns are tested and tuned in the factory for best performance and
Make sure that side lever is completely closed in the front position, failure
accuracy with JSB pellets.
to do so might result in damaged cocking mechanism. This kind of abuse is
not covered by warranty. Be sure to keep the rifle pointed in a safe direction
throughout this entire procedure.

Note Each cocking enters a pellet into the barrel so if not fired when cocked
you will end up with more than one pellet in the barrel.

One or two pellets in the barrel is usually manageable and possible to shoot
out depending on power but more than two might clog up the barrel making
it impossible to use.

If you want to end your shooting session with half used magazine It’s preferred
1 2 3 that you at least fire the round in your chamber and then remove the magazine
to make sure you do not store the gun with a pellet in the breech.

7.2 Removal of Magazine

Put the safety (30) in “Safe” position and then pull the cocking lever (6) rearwards.
Pull the locking mechanism (25) rearwards while you pull the magazine out of the slot.
Un-cock the rifle before putting it to side or leave it with open sidelever.

7.3 Zeroing the scope

When you feel you have a grip of the total function you can move on to dial in
4 5 your scope with support from the scope manual.

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7.4 Power Settings / Quick Tune System

The power setting for this gun is from the factory set for FX pellets or JSB
Exact pellets of the caliber of gun you have purchased.
To get the best out of the specific pellet you intend to use you might want to fine
tune the setting of the gun.

The standard liner that comes with the gun is mainly for pellets and hybrid 7.5 Valve Adjuster (42) (not available in all editions)
slugs. CLOCKWISE will reduce airflow and thus power.
If you are going to use heavy ammunition you will achieve the best result out of a COUNTER - CLOCKWISE will increase airflow and thus power.
liner that is specifically made for that purpose. Contact your dealer for more info.
This will allow you to fine tune the valve flow and air efficiency.
Before you make any alternations, it is important that you write down the current
setting so you always can go back to the factory settings. See page 26 for Default setting (max) depending on version
your own notes. 4 indication groves = Set one and a half turn out from last line.
6 indication groves = Set on the last line.
There is no magic formula on how to tune but there are some
basic guidelines:

For diabolo pellets you can aim for somewhere around 840 - 940 ft/s as this is
probably were you have the best chance of finding the best accuracy.

Higher power does not mean better accuracy.

Shorter barrels require higher pressure than longer barrels.

Too much hammer spring tension combined with low regulator pressure might
result in high air consumption.

Setting the power on the Impact can be done in four ways, Three of them are
easily adjusted without tools while shooting. These three will be explained in
this section. Fourth adjuster (regulator pressure) requires tools and will be
explained in section 8.1.

Why would I want to alter current power settings?

• Lower power to achieve less penetration.

• Increase power for higher penetration or longer distance.
• Lower power to get less air consumption when shooting short distance.
• Fine tune for better accuracy (sweet spot).
• Changed caliber, liner and/or ammunition.

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 7.6 Rear Macro Power Adjuster (59) – Hammer-spring tension adjuster

The Rear Macro Power Adjuster (spring tension hammer wheel) is a quick way
to tune the power and accuracy of your rifle and has 16 fixed levels.

Note The rifle must be un-cocked when you turn the power adjuster.

1 is on the low side and 16 is on the high side of spring tension.

High spring tension gives more power but uses more air.

Note for best results the hammer tension needs to work in coordinated effort
with the appropriate regulator pressure as described further in section 8.1.

NOTICE – NEVER adjust the power when rifle is cocked. Doing so might
damage the Rear Macro Power Adjuster and will void your warranty!

7.7 Micro Power Adjuster (43) – Fine Tune Barrel Roller

The Rear Macro Power Adjuster (or hammer-spring tension adjuster wheel)
is supported by the Micro Power Adjuster. This barrel roller on the side of the
rifle gives you the possibility to fine tune with precision. It is easy to operate by
rolling the wheel with your thumb and has marked grooves and digits to help
you navigate.

Towards 5 is increasing power and towards 1 is decreasing power.

Note At the lowest setting 1 on the Rear Macro Power Adjuster you will not be
able to set the Micro Power Adjuster all the way to 5 (max).

At the highest setting of 16 on the Rear Macro Power Adjuster you will not be
able to set the Micro Power Adjuster all the way to 1 (min).

There are circles on the scale of both hammer-spring adjusters. We recommended

to use these as starting points for re-tuning after changing projectile, caliber,
or regulator pressure.

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8 Adjustments Increase regulator pressure

8.1 Adjustable AMP Regulator Make sure you have full pressure (200+bar) in the tank before starting this
adjustment.
This system uses two different editions of regulator setups.
Single regulator setup
High power versions use a single regulator setup and some low power version
uses a dual regulator setup. Gently adjust regulator (58) counter-clockwise a quarter of a turn and check
the pressure on gauge (26), repeat until the wanted pressure has been
If you don’t have the information of what your gun is equipped with you can
reached.
easily do a quick check:
Dual regulator setup
Remove the bottle, see section 9.4. Singel setup, see image 53.a Dual setup,
see image 53.b. The first regulator (53.b) pre-reduces the pressure in preparation for the
second Regulator (58 and 26).
Tools required
2,5mm hex key, preferable with ball end. If you do not have access to a hex The secondary regulator sets the working output pressure for the rifle.
key with ball end you can make the adjustment more accessible by removing Gently adjust the second regulator (58) counter-clockwise a quarter of a turn
trigger guard, see section and check the pressure on gauge (26) Repeat until the wanted pressure has
been reached but do not exceed the pressure of the first regulator. To check
8.2. first regulator pressure you need to remove plug (55) and fit a gauge to thread
Normally you will want the regulator set at the lowest possible pressure for or contact the dealer for information. The first regulator is set from factory and
the velocity you aim for. should in most cases not be alternated.

We strongly recommend that you do not alter the pressure of the first regulator
but if it needs to be adjusted, follow these instructions.

Remove the bottle, see section 9.4. Gently adjust first regulator (53)
counter-clockwise a quarter of a turn re-attach the bottle and check the
pressure on gauge (55). Repeat this process until the wanted pressure has
been reached.

To decrease regulator pressure

Gently adjust the second regulator(58) clockwise a quarter of a turn, fire
off one empty shot in a safe direction Repeat this process until the wanted
pressure has been reached.
NOTICE – Make sure your rifle is not loaded before dry firing
NOTICE – NEVER adjust the regulator above 170bar as damage to the
system may occur and will void your warranty!
53 a 58 53 b
NOTICE – NEVER use the gun below the set regulator pressure as damage to
the system may occur and will void your warranty!
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 Factory setting of the trigger (variations may occur)
1 Break point position (2) adjusted so trigger base is approximately zero
degrees at break point.
2 1st stage/slack/travel (1) adjusted to a safe play (zero slack equals unsafe)
5 4 3 2 1
3 Break point resistance Soft – Activated Medium (4) and Hard (9) released.
4 Safety (10) – Must be controlled after any adjustments made to the trigger
system. See instructions further down the page.
5 Break point resistance Medium – Inactivated. If you want it activated
point 3 and 9 must be released.
6 Break point resistance Hard – Inactivated. If you want it activates
10 9 8 7 6 point 3 and 4 must be released.
Break point resistance

8.2 Quick Set Trigger (57) Consists of three adjustment screws but only one should be activated.
So, if you are to change you should release tension on the active one and app-
The quick set trigger can be set in various ways to fit your needs.
ly tension to the one you choose. When you notice that the trigger engages by
1 1 st Stage / Slack / Travel. your adjustment its good to know if you continue the adjustment, you will not
2 2 nd stage / Break point position/angle. make it stiffer, but you will override the originally set break point (2) position
3 2 nd stage / Break point resistance – Soft (match). and for each adjustment you make you move the break point.
4 2 nd stage / Break point resistance – Medium.
Break point position/angle
5 Hole for reaching second trigger sear – Do not tamper with!
6. Trigger blade. If trigger will not engage you might need to adjust counterclockwise.
7 Trigger blade locking screw. Setting the safety
8 Trigger reach locking screw. 1 Preparation
9 2 nd stage / Break Point resistance – Hard (hunter mode). • Before adjusting the safety, ensure you understand how to uncock the rifle
10 Safety. and that the trigger is set to your preferred settings. See page 7, section 3.2
Adjustment that does not affect safety for detailed instructions.

Trigger blade (6) can be adjusted in reach, height and even set in an angle. 2 Safety Precautions
Height and angle: loosen screw (7), tighten when in position. • Always point your rifle in a safe direction during this procedure.
Reach (trigger to grip distance): loosen screw (8), tighten when in position. • Treat the rifle as if it were loaded.
• Ensure no magazine is inserted in the rifle and that there is no ammunition in
Adjustments that affect safety (caution!)
the bore.
Following instruction only gives the essentials of the trigger,
3 Adjusting the Safety Screw (10)
there are numerous ways you can set this trigger system
• Once you’re familiar with the trigger settings, adjust the safety screw (10) by
which we can’t cover here. Instruction videos will be available
turning it clockwise as far in as possible while still allowing the rifle to fire
in our website.
cleanly without jamming. Be cautious not to adjust the screw too far in, as
20 this could cause a misfire. Adjust only with small tweaks at a time. 21
4 Safety check 9 Alternations
• Put the safety to safe position, cock the rifle without magazine or pellets in
9.1 Barrel-system (40)
the chamber and point it in a safe direction.
• Put more pressure to the trigger than you would in a normal shot, the trigger 50 A B C D
should not go off in a situation like this.
Note Do not use excessive force as this might bend the trigger or cause other
malfunctions.
The following information gives you the know how to perform a barrel swap.
• If the trigger goes off in this test you need to readjust the safety.
You can use a complete barrel kit (barrel and shroud) for fast swap between
Following these steps will help you safely and effectively set the safety on
calibers. Or, just barrel and muzzle as this new barrel system comes with a
your rifle.
replaceable muzzle (A). This feature gives you the opportunity to the keep the
WARNING – Adjustment to the trigger might cause safety malfunction. original shroud (B). You just change barrel (C) and muzzle with matching caliber.
Adjustments might void your warranty if done improperly.
For liner replacement see www.fxairguns.com.
Adjustments to one screw may impact the function or other aspects of the
Set the safety to its safe position.
trigger-function.
Make sure the rifle is un-cocked/Inactivate the trigger.
Proper tuning requires the know-how of what one adjustment does in relation
to another and should be performed by a trained specialist. Barrel

Never rely on the trigger or safety when pointing your rifle at any target. Loosen screw (3) or (35).

To ensure safety and reliability make sure you test thoroughly before you use. Pull the barrel (40) out of the system.
the rifle. Some barrels have dual air transfer ports (D) marked with letters stating which
ammunition it is intended to be used with. P = pellet, S = slug. The port you
NOTICE – All adjustments work in relationship with one another.
choose to use should be pointing downwards.
In order to get full access to the trigger you can remove the trigger guard.
Insert new barrel and make sure the small slot in the barrel breech lines-up
with the guide pin inside the breech block.
8.3 Recoil-pad (21)
When completely seated, you should be able to see a protruding edge of the
You can adjust the recoil-pad in
barrel inside the magazine slot (23). Once in position, tighten the locking screw.
height, loosen the locking screw
(22) to move the recoil-pad up and Misalignment will cause poor performance and might harm the airgun.
down. Once positioned where you NOTICE – Failure to tighten these locking screws can cause severe damage to
want it, tighten the locking screw. the rifle if fired.

22 23

DETAIL A
SCALE 2 : 1
Pellet-probe 9.3 Sidelever (6)

Loosen the recoil pad locking screw (22) and pull the recoil-pad (21) down This airgun is equipped with an ambidextrous sidelever mount (4 and 44).
to it’s lowest position. It comes delivered mounted on the right side (4) but can easily be repositioned
Pull the sidelever rearwards until you have the pellet-probe locking screw (1) on the left side (44) for left hand shooters.
visible between the slots. Slide the rail (7) (See section 4.1) of to get access to the locking screw.
Loosen the locking screw using a 1,5 mm hex key. Remove locking screws A and push pins B through the mounts from the
Pull the probe rearwards or tilt the gun backwards so the probe can fall out downside and up.
into your hand. Remove locking screw C and remove side lever handle.
Check that you have the correct caliber on the pellet probe. Relocate parts on the left-hand side.
Make sure the air transfer port (1.A) is pointing downwards. You should also
A B A B
see the caliber markings on the right side thru the slots.
There is a hex slot in the back of the pellets probe where you can use a 4 mm
hex key as guide to easier get the probe into correct position.
When in place tighten the locking screw again.
Inactivate the trigger when you close the sidelever.

NOTICE – Never fire the gun without pellet-probe mounted.

To complete the installation, you might need to adjust the power settings.

A B A B

C
21

22 1 1.a 23 3

9.2 AR 15 Grip (29)

DETAIL A

Grip can easily be replaced with other aftermarket grips.

SCALE 2 : 1

It’s easily replaced by removed screw (28) using a 5 mm hex key thru
the bottom of the grip. C
24 25
9.4 Pressure tank (51) 10 Accessory options
The bottle is equipped with its own valve so it 10.1 Angled 2nd Regulator Pressure Gauge (5)
is safe to unscrew it from the system.
You have the possibility to add an angled gauge for easy reading of the regulator
It will still hold air, when you unscrew it there pressure while shooting. More info can be found in our website or with our dealers.
will be a minor escape of air and this is perfectly normal.
10.2 Muzzle thread (50)
The regulator(s) will hold air even if you unscrew the bottle. 52
Covered by a thread protector is a ½” thread for airgun silencers (variations
WARNING Do not replace with another bottle without making sure that the may occur). Simply unscrew the cap to get to access to the thread.
new bottle has Valve Pin Bushing (52) mounted or has a diameters of NOTE Be aware that a silencer might have a negative effect on the accuracy!
3,6 mm. Valve pin bushing can be bought separately if older bottle is to be
used.Valve can not open without this bush. 11 Miscellaneous
11.1 Warranty
All FX Airguns carry a Three-Year Warranty against faulty workmanship and de-
fective materials. If it becomes necessary, first contact the dealer from which
Notes for you own settings
you purchased the gun. If the rifle is determined to have a defect within the
Make note of the factory setting before you start tuning the rifle. warranty period, contact the warranty center to arrange service. The warranty
guarantee does not cover any damage caused by tampering with the rifle or
Factory settings
abuse. This rifle should only be disassembled by factory-authorized repairmen.
Caliber
11.2 Maintenance
Barrel length
Keep the rifle clean.
Barrel type Steel parts will benefit from occasional oil treatment preventing them from corrosion.
Ammunition We recommend the use of cleaning pellets occasionally or if there is a sudden
change in accuracy.
Regulator 1
WARNING Never use chemicals or water to clean the rifle.
Regulator 2
11.3 Storage
Front Valve
Store dry and dark if possible.
Macro Adjuster
Preferable stored pressurized just above regulator pressure to max pressure.
Micro Adjuster
WARNING High humidity might cause corrosion if not treated correctly.
Velocity
Keep away from sunlight as this might damage o-rings and anodizing.
Distance
Never store the rifle with loaded magazine.
Remarks
Keep out of reach for children or unauthorized persons.

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 24.06.10

MADE IN SWEDEN

www.fxairguns.com