The XM4 carbine was six inches shorter than the M16A2, making it easier to carry in the back of a M2 Bradley infantry fighting vehicle, a UH-60 Blackhawk, or practically any other vehicle.

The WH-1000XM5 don't replace the vaunted WH-1000X4 -- they are an upgrade. Here's what's new, what's the same, and which you should buy.

In general, the WH-1000XM5—which remains a mouthful of a name—aren't a massive shift from their predecessor, and interestingly, Sony will continue to sell the prior XM4 alongside this new pair ...

In the early 1980s the U.S. government opted to call upon Colt to develop a new carbine version of the M16A2, and this began as the XM4 – it combined the best elements of the older XM177E2 , the ...