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Posted: 9/9/2004 6:03:58 AM EDT
I'm thinking of getting a A2 barrel that was installed on a Colt R6500.

The Colt R6500 uses a A1 upper receiver my Colt MT6551 has a A2 receiver.

My question is will the FSB be the correct height going from A1 to A2 receiver ?

Link Posted: 9/9/2004 4:16:37 PM EDT
Yep. No problems here.

Things get "iffy" when a flat top enters the equation.
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