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I live in the very gun-unfriendly state of New Jersey where you can't have a magazine that carries more than 15 rounds. I have been looking at the M&P 9mm. It comes with a 10 or a 17 round magazine. Is there any hope of using the 15 round .40 magazine in this gun? Am I stuck with the 10-rounder? Thanks.
 

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The 40 magazine works for 40 S&W and 357 Sig, the 9mm uses a different magazine. A 40 nag would fit, but probably wouldn't function properly.
 

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Actually has anybody tried it? Reason I ask is it works perfectly with HK USP compact mags. Has anyone actually compared the feed lips of the two mags?
 

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My question is, why would you want too?
 

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I helped a friend torture test some M&P's back in September. The object was to run rounds through the guns as rapidly as possible. Temperature readings were taken and shooters changed every 100 rounds. We put 3K rounds through both the .40 and the 9MM. The only stoppages occurred when we got some mags mixed up and loaded some 9MM rounds into a .40 mag. I don't know that I'd want to gamble with a gun I planned to carry.
 

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Does anyone know (on an M&P9 full size) what the difference is between the 17 round and 10 magazines (besides one holds 17 the other 10
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I mean the gun is the same - RIGHT? you could take a full size 10 round mag and stick it in any M&P9 - can't you?



I always thought there must be some plug - or maybe a real long follower - or some dimples in the mag tube that would only allow the follower to go down in the mag tube far enough to put in 10 rounds - and just leave empty space below



Could you modify a 17 round - in the same way they modified it to hold 10 - but have it hold 15 rounds?
 

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I would guess that if it did work, a 15-rd .40 mag would probably hold 17 rds of 9mm which would still be illegal anyway.


if he uses 10 round .40mags he can probably fit 14 9mm rounds. I might work just fine...(at least I know you can fit 14 9mm rounds into 10 round .40 Beretta 92 mags, I never tried shooting it though)
 

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That the same high temperature "torture test" done by Charles E. Petty in the Guns Annual?



Interesting.



Fewer rounds than the DHS endurance test (2,500 v 10,000), but tougher in another way as the guns got much hotter. During DHS testing the guns were fired in 250 round cycles, then cooled, cleaned, and lubed before continuing.
 

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BrokenArrow said:
That the same high temperature "torture test" done by Charles E. Petty in the Guns Annual?
That's probably the one although I haven't read the article. I don't think he's done another temp test since then. The upside (other than shooting free ammo) was getting to try out a potential purchase. I knew by the end of the day I'd be buying one when the .45's hit the market.

 
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