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Posted: 8/29/2005 12:33:48 AM EDT
any one ?
Link Posted: 8/29/2005 4:37:47 AM EDT
[Last Edit: 8/29/2005 4:50:18 AM EDT by Shawnr1]
Colt 9mm AR uppers are blowback and does not have a gas tube hole in the receiver.

ETA: Colt 9mm receivers does not have a forward assist. they also have a different brass deflector and ejection port cover.
Link Posted: 8/29/2005 4:44:18 AM EDT
They also don't have the case deflector "lump" and the forward assist.

You can use a .223 upper for 9mm, but you can't use a 9mm upper for .223.
Link Posted: 8/30/2005 4:56:23 AM EDT



photo courtesy of Autoweapons.com
Link Posted: 8/30/2005 1:13:38 PM EDT
Note: Internally they lack a half moon cutout which in a 5.56 is the space where the cam pin moves to when the bolt and carrier are locking the breech.
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