Following a blogwander that started with the Marines’ debate about switching to the M4 carbine, I found a really old post at Murdoc’s about the Canadian C7A2, the service rifle issued to the Canuckistani military. The C7A2 is unique in that it mounts an A2 length barrel (20 inches) on an M4 style adjustable stock.
I thinknit’s kind of a cool idea, actually. The 20 inch tube allows you to squeeze as much velocity as possible out of the 5.56 round, while the adjustable stock can make it more manageable in tight quarters. Since we don’t live in Canada, if you want an AR in this configuration, it’s as simple as buying a 20 inch flattop upper and sticking it on a collapsible-stock lower. Pretty cool.
Almost. You also need to match your buffer to the lower pressure gas system, or you’ll short stroke. YMMV.
Don’t forget the Elcan scope!
Last deployment I started seeing some troops, mostly non combat types, sporting A2s with collapsible stocks. They did it out of convenience.
The idea doesn’t make much sense. What you gain in velocity and accuracy is offset by the fact that you have a lowest bidder stock with a good deal of slop in it. The canooks would be better off with a 14.5 inch barrel and a full size stock or a straight-up M4.
The entire gun (yours or theirs) was made by the lowest bidder.