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Old 5 January 2018, 09:43
B 2/75's Avatar
B 2/75 B 2/75 is offline
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Join Date: Aug 2002
Location: Black Mountains
Posts: 10,790
It's a knurled aluminum free-float handguard.

Yesterday evening I actually changed it from a 7" to a 9" (exact same handguard, just longer) and changed it from the A2 birdcage to a FirePig-style brake, and then sold it on another forum.
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