40C / 9C - any difference in extractors or ejectors ? - MP-Pistol Forum

40C / 9C - any difference in extractors or ejectors ?

This is a discussion on 40C / 9C - any difference in extractors or ejectors ? within the MP Compact Pistols forums, part of the Smith & Wesson MP Forum category; Thinking I will try a Storm Lake conversion barrel from 40 to 9 in one of my M&P40C's. Brownells website says a change of extractor ...


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Old October 28th, 2016, 10:53 AM   #1
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40C / 9C - any difference in extractors or ejectors ?

Thinking I will try a Storm Lake conversion barrel from 40 to 9 in one of my M&P40C's.

Brownells website says a change of extractor & ejector is advised to enhance reliability of the conversion.

Elsewhere I have read that the extractor and ejector are THE SAME between the 40c and 9c.

So, which is right? Same? Or Different?

I'm tempted to just buy a complete M&P9C and not fuss with converting, but I have two M&P40C's, so one can easily be a conversion.

If someone has both 40C and 9C who can confirm if there are any differences in extractor and ejector, that would be great to know. Thanks.
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Old October 31st, 2016, 02:43 AM   #2
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Several knowledgeable people on this site have posted that there is no difference between the M&P 9 and M&P 40 except for the barrel assembly and recoil spring (and the recoil springs were even the same (blue) until about 2 or 3 years ago).

The part numbers are apparently the same; AFAIK this is still the case. I have fired a thousand rounds or so of 9mm through the 3 KKM 40-9 conversion barrels I own and I haven't changed anything but the barrels. I have had a few malfunctions with them but only within the first 2-3 magazines I run through the new barrels, after they break in a bit they're just as reliable as the factory barrel assemblies. If you have a newer .40 with the green recoil spring it might be worth it to buy a blue 9mm/old 40 recoil spring, but it's probably not necessary.

If you search brownells for M&P ejector even their product page says the same one fits 9mm/.40/.357 M&P's. I think even the APEX extractors are the same for .40/9/.357/.45 with the caveat that fitting may be required for .45.
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Old October 31st, 2016, 03:14 AM   #3
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I have broken 2 extractors with my SL 40-9 conversion barrels in M&P CORE. The gun would still run, but the top corner was chipped. If I were 2 to do it all over again, I would just buy a dedicated 9. I do not shoot much 40.
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Old January 12th, 2017, 01:56 PM   #4
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Is there some new problem with just swapping the barrels between the 40 and 9mm? My M&Ps are old but I have done that and haven't noticed any pbm. The conversion barrels are a new thing to me. are they any different than original barrels? I realize you might have to change the recoil spring but I think that is the only issue with just using original barrels rather than buying conversion barrels. What am I missing. I have even used 40 magazines with 9m rounds. Worked fine. May need to pinch the tops a little.
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Old January 12th, 2017, 02:05 PM   #5
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Quote:
Originally Posted by pinkerpv View Post
Is there some new problem with just swapping the barrels between the 40 and 9mm? My M&Ps are old but I have done that and haven't noticed any pbm. The conversion barrels are a new thing to me. are they any different than original barrels? I realize you might have to change the recoil spring but I think that is the only issue with just using original barrels rather than buying conversion barrels. What am I missing. I have even used 40 magazines with 9m rounds. Worked fine. May need to pinch the tops a little.
I'm not aware of anyone saying there is "a problem" with swapping barrels between the M&P nines and forties. If you've done it and it works fine, I'd say keep on keepin' on.

The topic in this thread is whether one might need to change out extractors or ejectors when changing calibers from 40 to 9. And, as I mentioned earlier, answering my own question, S&W informed me that the extractor and ejector are the same part, whether the caliber is 9mm or .40S&W.

With regard to barrels, conversion barrels come to mind when someone has a .40cal M&P and would like to buy a barrel to convert the pistol to 9mm. Someone who doesn't already have a factory M&P 9mm barrel (as you do have) would likely buy a third party conversion barrel. While a standard factory M&P 9mm barrel may suffice just as adequately as a 9mm conversion barrel, I suppose that it's possible that a conversion barrel may employ some minor geometric change which *may* contribute to caliber conversion reliability in some way.

Last edited by DHart; January 12th, 2017 at 02:13 PM.
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Old January 13th, 2017, 05:27 AM   #6
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Thanks for your reply. It makes sense. I was just wondering if there was something going on I didn't know about. Hadn't been on the forums for quite awhile.
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