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Hey Qlong, how does grinding that tab help the bolt catch the bolt carrier? Isnt it the small vertical tab on the right that blocks the bolt from coming forward? The only thing I can think the effect of sanding that tab is that the bolt catch can push more on the upper receiver.
Shouldnt the vertical tab that actually comes in contact with the edge of the bolt be longer so that it has more contact with the bolt?? Right now, theres only a few millimeters that contacts the bolt
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