The purple laser for gun is 405nm violet purple laser gun sight for pistol or rifles.

Most of the purple lasers for gun are 405nm wavelength purple violet lasers. The 445nm laser is not purple color, therefore the blue lasers for gun and the purple lasers for gun are different.

Check the following picture to see the purple laser target dot color.

You can buy the purple laser for gun here at Beamqlaser for just 89$.

Amazon Ade Advanced Optics HB06-1 Triple Duty 450nm Blue/Violet Laser Sight with Picatinny Mount

eBay Ade Advanced Optics Strong BLUE/Violet LASER Sight for rifle/shotgun with Mount

P3P – Purple Laser Sight
But it seems to be out of stock

SERIOUS PERFORMANCE BOTH ON THE RANGE AND IN THE FIELD – the P3P has a bright purple laser which is clearly visible especially at night while still meeting law requirements <5mW peak, 532nm, Class 3a;
DURABLE AND BUILT TO LAST – made from military grade nylon the P3P is designed to work under the harshest conditions to provide reliable performance time and time again. Backed by a 1 year warranty at HiLight Tactical we stand behind our products;
INCREASED SPEED AND ACCURACY – the included Allen wrench makes it very easy to dial the red dot sight into the distance you want so even when hip firing missing the target becomes a thing of the past;

You can see a violet laser target dot at the following pictures.