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Here's a quote from another forum at the following URL:



http://www.socnetcentral.com/vb/showthread.php?t=57833



Smith & Wesson M&P 9mm



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John Sanchez from S&W dropped by yesterday with a few toys. I've shot AR's 'til I'm sick of them (not really) so I focused on the new pistol line.



All I can say is that in 500 rounds I didn't have a single malfunction. I even shot 9mm from the .40 magazine as a test. It worked.


Being a newbie, this makes no sense to me. Is this fellow saying that he can use 9mm cartridges in a .40 SW M&P?!



Or is hey saying that the .40 SW magazine will fit in the 9mm M&P with 9mm cartridges?



Could someone explain this to me?



Thanks!



Confusedly Yours,



Cet.
 

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I believe he is saying he used .40s&w mags, firing 9mm cartridges through a 9mm M&P. Its not really that uncommon, during the Clinton ban, many people were using .40 mags in 9mm pistols to get more than 10 rounds.
 

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phred said:
I believe he is saying he used .40s&w mags, firing 9mm cartridges through a 9mm M&P. Its not really that uncommon, during the Clinton ban, many people were using .40 mags in 9mm pistols to get more than 10 rounds.
That's the way I would take it also. It goes without saying that you never try to shoot a 9mm cartridge in a pistol chambered for any other caliber.
 

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You can get 18 9mm rounds into the 40 mag if anyone cares. The do function pretty well with one small problem it likes to lock the slide back with 1 round still in the mag although it is likely that, that could easily be fixed.
 

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I wish the mags were not interchangable. The other day may son and I had the pistols out and one of the .40s got a full 9MM mag inserted. Good thing I double check everything because I think it would have fed the 9 into the .40 and functioned. I am not worried about the other way around because the .40 would not fit into the 9s chamber. I don't know what would happen if you chambered and fired a 9MM in a .40 chamber. Don't want to find out by accident. The mags have minor differences in the bodies but interchange and lock in to either cal pistol. I just put a .40 round in a 9MM mag and locked the mag in a .40 pistol and it fed fine. :?
 

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BSTOCK said:
I wish the mags were not interchangable. The other day may son and I had the pistols out and one of the .40s got a full 9MM mag inserted. Good thing I double check everything because I think it would have fed the 9 into the .40 and functioned. I am not worried about the other way around because the .40 would not fit into the 9s chamber. I don't know what would happen if you chambered and fired a 9MM in a .40 chamber. Don't want to find out by accident. The mags have minor differences in the bodies but interchange and lock in to either cal pistol. I just put a .40 round in a 9MM mag and locked the mag in a .40 pistol and it fed fine. :?


you can't imagine how many 9mm's I have found from ranges that are belled out to .40 sizes.



They fire, but don't extract reliabily, and arn't accurate.
 

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Jester said:
[quote name='BSTOCK']I wish the mags were not interchangable. The other day may son and I had the pistols out and one of the .40s got a full 9MM mag inserted. Good thing I double check everything because I think it would have fed the 9 into the .40 and functioned. I am not worried about the other way around because the .40 would not fit into the 9s chamber. I don't know what would happen if you chambered and fired a 9MM in a .40 chamber. Don't want to find out by accident. The mags have minor differences in the bodies but interchange and lock in to either cal pistol. I just put a .40 round in a 9MM mag and locked the mag in a .40 pistol and it fed fine. :?


you can't imagine how many 9mm's I have found from ranges that are belled out to .40 sizes.



They fire, but don't extract reliabily, and arn't accurate.[/quote]



Do you know if there is any barrel damage due to fireing a 9MM from a .40? I am not talking about heavy usage just on or two by mistake.
 

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no damage, I have acutally not done it, but my cousin who used to shoot comp has seen it done, and you just get a really inaccurate pistol, and no ejection.
 
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