I would make sure that its 100% bolt catch alone before you do that and if you do only grind the outside of the tab - so if the paddle (the part you push to release the bolt) is facing towards you - then the part that makes contact with the bolt is directly behind it.. I you want to grind off the paddle side of that nub.... but use a file and slowly file down.. do ten or so strokes then put it back in and see what happens and keep doing until it works properly .... also search the dedicated WE AWSS M4 thread... there is tonnes of info on there that may or may not help you.. that and the guys in there really no what they are talking about... I solved all my issues in that thread! Good Luck!
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