There is a extension for the mags but its a prototype, not in production yet but a few members here were given testing peices.
Polishing gives a smoother pull and a better stage for precise shots and it reduces future wear. Polishing tge feed ramp allows better feeding of rounds and less future jamming, i polished my whole barrel to reduce any friction with blowback and lockup.
People have said polishing will void warrenTy but it seems S&W CS differs per case and results are different also. If you want a definite answer i would call S&W to hear it for yourself and decide wether to proceed or not, i did and Im very happy.
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please care, use hollowpoints
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