A U.S. special operator trains on firing his M4 carbine long-distance at Melrose Air Force Range, New Mexico, in March 2018. (Tech. Sgt. Sam Weaver/Air Force) Using a mid-length gas system on an M4A1 ...
Buying the right M4 off the shelf is, at best, an exercise in reading the fine print. And, at worst, it's a frustrating waiting game. Popular configurations in every brand seem to sell out instantly, ...
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