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Which models/barrel lengths of the M&P play well with the sport?
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Both the full-size 4" and competition-size 5" are fine for USPSA and IDPA. None of the engagement distances are far enough that you need the 5", and some people like the lesser mass of the 4" for a (theoretical) faster transition between targets.
My personal preference is the 5" because I like the added muzzle weight and longer sight radius, but others aren't wrong for liking the 4" better.