S&W MP 9

[dsm2nr]

My Kimber Warrior will drop the slide when a mag is inserted somewhere between firmly and harshly.

M&Ps are nice guns, feel better in my hand than a Glock, anways. I'll probably get one eventually.

Weird. It takes way more pressure for me to even seat my Kimber Warriors mag than my m&p 9 pro and the Warrior has never done it for me. I guess I slap mags in too hard or something because my m&p and my old glock 17 slide forward on their own 75% of the time. Im going to try to figure out a way to let me slam home mags and still have to rack for the sake of consistency.

[Erik_Pakieser]

This is a known problem with the M&P. S&W will attempt to fix this if the gun is under warranty. Anecdotally, people have gotten mixed results.

I had this problem for a while on my M&P 9L. I went away after a while, can't say why.

On the M&P Pistols d-board there is some discussion about filing the slide stop notch, have not tried that myself.

[Ken]

My HK P30 does it if I slam a mag in. I've never not been able to do it. I don't think I'd call it a feature or a defect, it is what it is.

[EJSG19]

my G21 will do this occasionally, as others have said somewhere between seating the mag firmly and HARD.

wouldn't bother me if it did it either always or never. But when its only once in a while its hard to get used to. Always makes me think something is wrong before I realize what happened, which ends up making me take more time to get back to shooting.

Still, not something I'll likely try and get "fixed" as I don't see it has a big problem.

[bstrawse]

The HK USP pistols do this as well
b

Really? I can get my buddies Glock 19 to do this all day but have never gotten my USP 45 fullsize to do it, is this a compact only thing maybe?

Could be - My USP Compact .40 does this consistently
b

[SAM]

I guess I'll look at it as a "feature"---not a problem. I guess as long as it does not go bang when it slams closed.