Under that brass ring, over the end of the hop rubber. It should tighten up that brass ring to the inner and allow it to sit where it should, and it should help the airseal
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current armament: mk43, ump.45, p90, barret, m14, g33, k98, m4 tac, m4 swat, mp5 navy, vsr10, p226, m9.
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