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For those of you looking for more positive bolt catch engagement in an M4 open bolt, try swapping out your WE magazine release for a RS magazine release. I've noticed my magazine sits a lot more tighter now, and my bolt catch has extended fully every single time I've tested it, as opposed to halfway or less before.
DPMS makes a good catch for ~$3.00. You can find it at Brownells'.
As well, the WE barrel nut's teeth are larger than milspec, so handguards and rails will wobble slightly. I replaced the delta ring and it reduced maybe 25% of the wobble. With a new barrel nut, no wobble even with a handgrip mounted on a rail bolted to the handguard.
Last edited by MaybeStopCalling; January 16th, 2013 at 00:52..
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