Whoa!!

Thought the original question was good and honestly I'm surprised this is such a common occurrence. It has happened several times to me with my M&P 9c but I'm guessing it's because I sometimes seat the magazine too firmly. I think I do this at times because sometimes I seat a full mag with slide closed and it takes a good hit. Not sure if that's bad to be honest but it seems like its pretty normal. Anyway just thought I would share my experience.
 
Thought the original question was good and honestly I'm surprised this is such a common occurrence. It has happened several times to me with my M&P 9c but I'm guessing it's because I sometimes seat the magazine too firmly. I think I do this at times because sometimes I seat a full mag with slide closed and it takes a good hit. Not sure if that's bad to be honest but it seems like its pretty normal. Anyway just thought I would share my experience.

I used to always load a full mag with the slide closed then rack the slide. Lately I've been doing it with the slide locked back and it goes in alot easier. I gave it some extra oomph last night and that's how I discovered the slide slamming home and chambering the round.
 
How do you release the slide after loading up a magazine??

If you use the slide catch to release the ,its possible that you have rounded up the slide catch cut-out
 
This has definitely happened to me with my 45c. My instructor noted the same thing that others here have said: the auto forwarding (which I dislike) is being caused by inserting the magazine at a bit of an angle. The 45c, new, as others have said is difficult to inset a full magazine. I have found that with practice and also use, the auto forwarding is less common. Btw, I've practiced this many times home and I don't think anything I was doing would raise anyone's warning flags... I've very carefully practiced my reloads in my home filling mags with snap caps (to duplicate the same pressure of a full mag). This is all done in a specific room that is for dry fire/ snap caps only.

OP: hope you can get it figured out with practice!
 
Ive done it on my XDm and my Springfield 1911. My buddys new loaded Springfield 1911 has done it as well. I can't get the "autoload" to happen everytime but I did notice like others have already stated. If you really palm the mag hard while inserting its more likely to happen.

I wish mine would do it all of the time actually. Why wouldn't it be a good feature? I feel anytime you're putting a mag into the gun a round should be chambered and ready to shoot. Why else would someone put a mag into a gun and then set it down or carry unchambered? Looking for more trouble that way in my opinion. Evey gun should be treated as if it were loaded anyways right?
 
Please don't make this a Glock bash but I'd really like to know if your M&P's do the same.

I've been shooting pistols since the early 1980's.

I've had this happen with just about every type of pistol, except for my 1911's and Hi-Powers.

I've experienced it in the following:

S&W 5906/5946's
M&P's
Sig 226's
Beretta 92's
Glock 9mm's

Some designs more than others.

Some internet sites make this out to be a huge deal. I have never found it to be an issue. I have only had it happen while reloading under stress, where I may "slam" a magazine in hard enough to bounce the slide off of the slide release. Even then, It's a rare thing for me.

I've carried an issued M&P9 since the spring of 2006. I've had this happen to my M&P once that I can remember.

When sitting in my home, loading a gun, I'm not under stress. Therefore I don't slam the magazine, I insert it.

To me, it's a non-issue.

I'll not bash a Glock 9mm. I carried a Glock 19 off-duty for about 11 years. I still own a few Glock 9mm's. But I now carry a M&P9c when off-duty. When that's a bit too much (rare occasion) my M&P Shield has replaced my PPS and my Kahr PM9 as my official "little gun", and as my BUG at work.

Glockman, if you're interested in the M&P, then try to shoot one. I think you'll like it. Just keep an open mind and don't worry about the whole slide forward issue.
 
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While it's not a feature I count on, I do sklam them in...if it closes--which it does most of the time--so much the better.
 
I have several 1911's and EAA Witnesses that do this regularly. I prefer it that way, and I mash the magazine in there hard enough to make sure it's properly seated. To me, it speeds up the reload and eliminates an extra step. I've had my 40 S&W Witness since 1990, reloaded it thousands of times, and have seen no ill effects from slamming a loaded mag in.
 
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