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3/25/2010 11:40:13 AM EDT
Are the gas tubes in an AR15 carbine and an AR10 carbine the same size width and size?
3/25/2010 12:53:42 PM EDT
[#1]
No, IIRC, the AR-10 carbine uses it's own specialized gas tube in terms of length.  IIRC it's closer to a mid-length AR-15 gas tube.

I have an AR-10 and don't fully recall the specifics, but I know enough to know it is not interchangeable with the standard AR-15 carbine system.
3/25/2010 1:08:10 PM EDT
[#2]
From AR-10 FAQ in the AR-10 forum:

AR-10 gas tubes of the same type (mid-length or rifle-length) are basically 3/16" longer than similar tubes for AR-15's. They also have additional bend put into the "kink" that's usually there. This is to account for the larger diameter bolt carrier and it's higher location of the gas key from the bore centerline.

From Armalite tech note 6

GAS TUBE: .The AR-10 gas tube is .240 inch longer than the M-16 gas tube used on the M-16 or the SR-25 to allow use of standard handguards and the spring loaded slip ring of the AR-10A2 and -A4.

The length of the carbine gas tube is 11 1/2" for the standard 8" (midlenght handguard).

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