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hi guys ive never had any issues with my M&P 40 full size until recently it seems to be crusing the brass on the top of the slide during ejecting, im useing new ammo not re-loads. Same ammo ive been shooting all along. i have maybe 2000 rounds through the gun. I tried using my lower on my buddys upper from his M&P 40 and the brass still seems to be catching the slide. I put his buffer spring/guiderod in my gun and it doesnt seem to crush the brass. Still looks like it scrapes a little but not nearly as bad. Im thinking maybe the buffer spring is failing? no ides anyone have any ideas? i have completely stripped the gun down cleaned and lubed it back up and still having the same problems
 

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Replace the recoil spring assy.
 
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