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I just want to improve the performance of my SW40VE. Which I do with all my work horse and competition pistols.
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I shoot USPSA and IDPA, and sometimes shoot a Sigma in SSP for club matches. My Sigmas are essentially stock, but carefully action polished and much used.
My experience is that an M&P is better suited for serious competition when the entry fees pass $100, and has many choices in sights and trigger versions. I shoot the M&P 9 Pro 5" in sanctioned competion, as do many.
However, the Sigma does not have much aftermarket support, and there is very little "improve the performance" available, depending on what you mean by that(?) You can get night sights. You can polish the action. Apex has a kit that lowers the trigger pull by not quite 2#.
The #1 reason people drop out of my IDPA matches is that they start cutting springs or some such and "improve" a perfectly good gun until it is no longer reliable.