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Old May 4, 2015, 12:08 AM   #1
roval
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Join Date: April 8, 2011
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are there issues mating a carbine AR lower to a 20 or longer upper

I'm interested in getting a 20 inch ar,of course getting an upper would be cheaper. Any issues with a carbine buffer and a rifle length gas system?
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Old May 4, 2015, 12:20 AM   #2
ugaarguy
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Functionally, no: The Canadians did it as the C7A2. The only downside is they feel heavier than they actually are to many users since such a large percentage of the is so far forward.
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Old May 4, 2015, 12:49 AM   #3
Jackal
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It will work. I just built an 18" with rifle length gas. Using an H buffer this rifle is smooth as silk. Much smoother shooting than my carbine. Yes, weight/balance can be an issue, depending on the barrel profile.
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Old May 5, 2015, 02:17 PM   #4
henschman
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No problem whatsoever. I think thhe balance issue is overblown. I can vouch that it isn't an issue with a gov't profile (or lighter) barrel. If you have an HBAR, yeah, it's gonna be front-heavy... But those are front heavy regardless of what stock you use.
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Old May 5, 2015, 06:33 PM   #5
Robert
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I run a 20" barrel on my AR with a collapsible stock and carbine buffer with no issues at all.
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Old May 5, 2015, 07:03 PM   #6
loose noose
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Note, I recently put a 20" SS Bull barrel on my A-1 stock, made the whole gun considerably a lot heavier than the standard carbine was with the 16" military barrel, but it is one heck of an accurate bench rest rifle.
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