m&p9 slide automaticly closes with loaded mag

[Slavex]

I'll tell you a pistol it doesn't happen on. my Tanfoglio Stock II with factory mags. Due to the fact that the mags travel into the body of the pistol is stopped by the mag catch, and not the baseplate, the slide will not go forward automatically. Most every other CZ type mag I've used in the gun does allow for that though. weird.
to get into the habit of whacking the mag repeatedly if the slide doesn't go forward on mag insertion, is a bad idea. learn to use the slide release or the rack and go method. hitting the mag repeatedly is setting yourself up for failure and really bad tunnel vision in a stress situation.
if the slide is going forward even on "soft" insertions you may have a problem inspect all the edges of the engaging parts and see if there is any rounding off. There shouldn't be, at least not yet and not for a long time either. As TDC mentioned slides go home sometimes without stripping the round off. it's rare, and usually is a result of a bad seating job, or impact on the pistol during the reload, or something wrong with the first round in the mag (debris caught up in the mag etc). it's a very very rare occurrence though.

 

[r106]

Hey r106 -

If you lock the slide back on your M&P and look into the action you'll notice a small 'tab' just to the left of the feedramp/barrel/chamber. This tab is part of the slide-lock-lever. With an empty magazine, the mag follower (plastic part that is between the bullets and the mag spring) pushes this tab/lever upwards, thereby locking the slide back. With a bullet in the mag, the follower is a fraction of an inch lower, thereby not locking the slide and allowing the slide to release forward stripping the bullet off the mag, and onto the feedramp / into the chamber.

My well-worn Glock 22 releases the slide upon an agressive full-mag-load/slap but does not release the slide with a slow-speed full-mag-load.

My new (<500rds) M&P9 does not release the slide upon either an agressive nor a normal full-mag-load. Perhaps this may change in the future...

If you lock the slide back on your pistol and examine the slide-lock-lever tab, and it's interaction with an empty or loaded magazine (dummy rounds / snap caps if possible, else extreme caution please) - you may see something awry.

Perhaps the lever is bent downwards, always engaging the mag follower? Could have been caused by a jam or stovepipe. Perhaps the bullets you are using engage the slide lock tab?

Let us know what you find...

PS. I had to go get my M&P9 out of the safe to look for myself and write up these instructions. Not that I need an excuse to fondle my new toy... I was trying some various recipes in 9x19 and made a few dummy rounds (bullet but no primer or powder) - come in handy for resetting my dies after changes and for tests such as this.

Thanks for the info I'll check it out

 

[r106]

Ok.. I didn't even think to check this.. my two original mags all is normal.. the problem is with the 2 new ones I got a month ago. 1234-789 rounds in the mag they are fine but when I put a full 10 in, sometimes it hits that little lever in the mag well with little force being applied. by sometimes I mean 1 out of 6 it does it... Thanks ricochet and Slavex for the usefull info

 

[BooSSted]

My M&P does this all the time too. I would rather it happens this way. If you dont want your pistol to load automatically when you put the mags in, just do a closed action reload.....

 

[Paulinski]

My G19 does that it. All is well.

 

[TheGamerXxX]

First of... I dont believe in using something as small as a slide release... Racking the slide backwards is my preferred method.

Secondly...(?) Does slamming a mag in and dropping the slide than, wear out the slide release faster than racking the slide? I mean the very point of the release must wear out if the slide rides it all the way to the tip?

Luke

 

[Griffoneur]

First of... I dont believe in using something as small as a slide release... Racking the slide backwards is my preferred method.

Secondly...(?) Does slamming a mag in and dropping the slide than, wear out the slide release faster than racking the slide? I mean the very point of the release must wear out if the slide rides it all the way to the tip?

Luke

Those that would use the agressive/slam mag load would be doing so in the event that their ass was being shot at! In which case, wear and tear is furthest from their minds!

In the "normal" day-to-day use of a pistol, I, as you, pull the slide back and let it go.