M&P 9c Cannot insert full magazine

[EnjoyRC]

When I completely fill the magazine with 12 rounds, it will not click in. If I remove 1 round (11 total), it clicks in perfectly every time. My wife and I have the same, new, M&Ps. Both manufactured the same day. December 2012. Both do this.

Ammo: Walmart Federal Ammunition Champion 9mm

Is it a flaw?
Is it common?
Is it due to the ammo?

 

[91kid]

My sd40ve is a pain to get a full mag in, but I always just push a little harder and it snaps in

 

[RobzGuns]

When a mag is fully loaded, there should still be about 1/4"-1/2" give/push (more room) for the spring to move. This extra room gets compressed when you insert a full mag when the slide is closed.

Most likely, the mag springs simply need to wear-in a bit, but every once in a while, a mag spring will get installed backwards, which can cause problems.

 

[rraisley]

When a mag is fully loaded, there should still be about 1/4"-1/2" give/push (more room) for the spring to move. This extra room gets compressed when you insert a full mag when the slide is closed.

Not so with MY 9C. I've got 10 round mags with it, and I can't even use my speedloader to get the 10th round in, it's so tight (as the speedloader takes up a 1/16-1/8" or so). So I load that round by hand. But it's VERY tight, and I had to have someone else do it the first time.

Although I can load that fully loaded mag into my 9C, there's no way there's an extra 1/4" to 1/2" compression available.

 

[OKFC05]

Anytime you load with the slide closed, the cartridges must compress another half a cartridge depth against the bottom of the slide. If you load with an open slide, you will not have this issue. This is the type of fundamental information you get if you take an NRA basic pistol course, and learn the manual of arms for your handgun.

 

[EnjoyRC]

I appreciate you sharing your knowledge. That makes perfect sense to have the slide open.

 

[EnjoyRC]

Anytime you load with the slide closed, the cartridges must compress another half a cartridge depth against the bottom of the slide. If you load with an open slide, you will not have this issue. This is the type of fundamental information you get if you take an NRA basic pistol course, and learn the manual of arms for your handgun.

Not so "12+1" then???
Consider me "told" about training. And I have read the manual.

 

[timn8er]

My 40c was the same way. The magazines just need to
lose a little tension & then you'll be able to load them without
any problems.

 

[EnjoyRC]

My 40c was the same way. The magazines just need to
lose a little tension & then you'll be able to load them without
any problems.

Thanks for the response. Yes they're new. I'll need to break um in.

 

[rraisley]

Not so "12+1" then???
Consider me "told" about training. And I have read the manual.

Exactly. In order to have the full capacity "+1" of any gun, the mag must be loaded with the slide in firing position.

 

[Rastoff]

When a mag is fully loaded, there should still be about 1/4"-1/2" give/push (more room) for the spring to move.

No, this is completely wrong. While there should be a little room for movement, even with a full mag, it is certainly not 1/4" - 1/2".

If it were, the magazine would have room for another round. A 9mm is only .35" in diameter. So, even 1/4" is over 2/3rds the diameter of the round. There simply isn't that much movement in a fully loaded mag.

So, yes, there should be enough movement to insert a fully loaded mag. That will be about 1/2 a bullet diameter or 3/16" in the case of a 9mm mag.

 

[Zjnovak]

My 9c was the same. Either lock the slide back then insert it or keep the mags loaded and wear them in.

 

[BigBlueSix]

Mine is the same. Looking forward to it loosening a little over time.

 

[Etemmu]

I carry a 9c, 12 round mag, empty chamber. No problem getting the mag to seat with the gun in battery. Not even when it was new. Maybe I am one of the lucky ones!?

 

[Dikinalaska]

No, this is completely wrong. While there should be a little room for movement, even with a full mag, it is certainly not 1/4" - 1/2".

If it were, the magazine would have room for another round. A 9mm is only .35" in diameter. So, even 1/4" is over 2/3rds the diameter of the round. There simply isn't that much movement in a fully loaded mag.

So, yes, there should be enough movement to insert a fully loaded mag. That will be about 1/2 a bullet diameter or 3/16" in the case of a 9mm mag.

I don't quite understand your post, you say there shouldn't be 1/4-1/2" but than say yes there should be enough movement to insert a fully loaded mag that will be about 3/16th. 3/16th is 1/16th MORE than 1/4 inch. So 1/4(2/16)-1/2(4/16) would be about right by your last statement.

 

[Shuutr]

3/16" is 1/16" less than 1/4". 1/4" is 4/16"

 

[Rastoff]

Shuutr is correct. Dik you need to recheck your measurements.

 

[Dikinalaska]

Yup. Posting first thing in the morning makes me look dumb sorry

 

[Rastoff]

No sweat friend. We've all done it or will do it.

 

[Dikinalaska]

It would explain why it didn't make sense to me in the first place.