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Old 02-09-2014, 14:57   #10
MK262MOD1
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Join Date: Dec 2010
Location: ISO
Posts: 297
Rather hard to tell from that photo. It could be but looks to round on the breech side of the brake. An A2 will have flats for the wrench.

Yes the A2 brake is used on more than the M4. Several AR variants use it.
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