17 +1 (+1?)

[bgs210]

I was loading ammo into the M&P FS magazines last week. I had just bought 50 rounds of 147g and filling 3 magazines. One extra round was placed next to the full box on the bench. I wasn't paying attention and came up short with the last magazine and only had 16 rounds installed. Thinking I had drop a round, I searched and couldn't find it.

I picked up magazine one and the odd windows were full to 17.
Check magazine two and the even windows were full. WHAT??? Now I missing two rounds.

I thought, NO WAY... I pushed one round out and now the odd windows were full to 17!

I HAD 18 ROUNDS IN THAT MAGAZINE!!!

I then proceeded to put 18 rounds in all three magazines. They went in -
with even a little more play and spring action. I installed a magazine and racked the slide and the round went into the barrel as designed.

Next day, I went by the local gun shop and demonstrated my discovery on one of the M&P 9FS on display. Jaws dropped.

Has anyone else experienced this???
What can go wrong with this?

 

[Knightrider03m]

Holy **** mine can do that same. I still would leave it at 17 just in case of feed problems.

 

[Knightrider03m]

Really? I didn't even use any curse words

 

[kyf]

Interesting, just checked my FS 9 Pro and there is no way I could shove an extra round in the mags. 17 is it.....

 

[mlapaglia]

Was this a mag with the round button or the new square one on the bottom?

 

[Knightrider03m]

My mag is a square bottom

 

[clcdawg]

I can get 18 in mine also. I learned it the other day when a guy on YouTube said you could do it.

 

[nosreme]

Don't know I could handle this kind of high-impact drama so am glad I got rid of my M&P.

 

[evnash]

only problem with packing a mag so tight is that if you try to reload with a closed slide, there mags will sometimes bounce and not seat. the bullets need to be able to slide down in the mag just a bit when you are seating the mag.

 

[dannybot]

I had just logged on to brag about this very thing! I discovered it accidentally same as bgs had, but initially only one mag would allow me to do this. As time passed, the other loosened up enough to allow 18 rds. I had gotten a third magazine for Christmas that was a slightly different design, but after a few range trips, it too allowed the additional load. I also learned in a sort of humiliating fashion what evnash said, dropping a mag twice at a USPSA event.

So I can't say for sure if it's worth it, I may just get extended mags for USPSA shoots.

 

[clcdawg]

As I posted earlier I found out about this last weekend but I still only put 17 in them. I just trust 17 more and really if 17 will not get it done then that extra round is not important. Lol.

 

[SurgicalShark]

If you have to fire more than three rounds you don't want to be there.

S&W M&P.40 4.5, Ameriglo Night Sights, Apex DCAEK

 

[The Sarge]

You can often "sneak" in an extra round in almost any brand of magazine. Not a good thing as you are compressing the magazine spring more than as it was designed for. Bill

 

[bclaus18]

If you have to fire more than three rounds you don't want to be there.

If you have to fire one round you don't usually want to be there.