[quote author=OTO27 link=topic=21.msg252#msg252 date=1264628979]
I sure hope that the diference between the two go beyond the handguard and select fire. for starters, I dont know how the military feels about a 1 in 9" twist barrel. Me being local PD, 1 in 9" is more than enough for the rounds we use. The military is a different story, they need the 1 in 7" to stabilize heavier rounds out of the 14" and 16" barrels. Go beyond the 77gr stuff and you start to see major drops in ballistic performance. Even the 62gr penetrators prefer the 1 in 7 over the 1 in 9, though the difference is minimal at 0-200 yards, you start to notice it pass the 200 yard line mark.
Well this shouldnt be a big deal, arent they using a regular M4 barrel anyways? there are plenty of 1 in 7" barrels out there they can stick on it. Heck if thats the case I will be buying me one and sticking it on there.
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I do not see how they could use standard M4 barrels given the design of the QD feature. If they are using M4 barrles, then they are using proprietary extensions. Either way, you will have to have a barrel design and made for the ACR.