I've been shooting 5.7x28 for 19+ years via the PS90 and the M&P 5.7 is the first 5.7 pistol I have. I've shot the Five-seveN pistol before.


The M&P 5.7 and 22 Magnum use the same/similar slide dimensions as the MGW Sight-Pro shoes are the same for both (SP175). And it seems they both use the Tempo gas system.

Also I found out the M&P 5.7 bore is more of a 22LR bore size than 5.56/5.7/.223 the reason being that my Geissele 5.56 alignment rod wouldn't fit through the M&P 5.7 barrel. I had to buy a Griffin 22 cal alignment rod to fit through.

There are some M&P 5.7 forums (I am on at least one) but its fairly quiet.