Bill Schwab Posted August 20, 2012 Share Posted August 20, 2012 I'm about to purchase a 5" M&P 40 Pro and saw that KKM sells a 40 to 9 barrel. Seems like a neat idea, but I'm concerned that the 40 breechface, extractor and heavier recoil spring may cause malfs. Anyone have experience with one of these conversion barrels? Link to comment Share on other sites More sharing options...
horseman Posted August 21, 2012 Share Posted August 21, 2012 Sort of. One of the members here offered me a factory 9mm 5 inch barrel to give the conversion a try. Worked slick. I think all of those parts you are worried about are the same for 9mm as .40. There were several threads when I researched it. Someone posted the part numbers for the parts at Brownell's were the same for both as I recall. Course I can't remember what I had for lunch and YMMV. Link to comment Share on other sites More sharing options...
AustinT Posted August 21, 2012 Share Posted August 21, 2012 There are quite a few folks using a plain 9mm barrel in an M&P40, the conversion barrel is probably better, but both work! Link to comment Share on other sites More sharing options...
Bill Schwab Posted August 21, 2012 Author Share Posted August 21, 2012 Fantastic Link to comment Share on other sites More sharing options...
GeraldMeharry Posted August 21, 2012 Share Posted August 21, 2012 Haven't had one problem with it. Runs like a champ. Used it in a limited match. It's a lonewolf 35 barrel 40-9. Link to comment Share on other sites More sharing options...
Anopsis Posted August 21, 2012 Share Posted August 21, 2012 I considered doing the conversion on mine, but since I'm standardized on .40 in other divisions I decided to just load .40 Minor vs. buying a barrel, mags, dies, etc. If you're already set up to reload 9mm, or don't reload at all, then I guess the conversion is the way to go. Good luck! Link to comment Share on other sites More sharing options...
laz2011 Posted August 22, 2012 Share Posted August 22, 2012 I'm looking in to a conversion for my 40s&w to 9mm.Have mags for both will give it a try and see.Two guns for the price of one. Link to comment Share on other sites More sharing options...
JeffWard Posted August 22, 2012 Share Posted August 22, 2012 The Storm Lake and KKM conversions shoot GREAT in the 40Cal M&Ps. A STOCK 9mm barrel will FUNCTION in a 40 slide, but is not accurate or safe due to size differences in the locking block and barrel lugs. Of course you cannot shoot your 40-9 conversion in Production, since rules mandate same caliber barrel-swaps only. You'll also need 9mm factory mags. Jeff Link to comment Share on other sites More sharing options...
FightFireJay Posted August 24, 2012 Share Posted August 24, 2012 I have a 5" KKM 40-9 barrel in my 40 pro. It shoots well, POA/POI is pretty close to the OEM .40 barrel. it's a mirror finish on the inside compared to the stock barrels rougher looking texture. I haven't done anything to the extractor/ejector and the only time I have had an issue was with underpowered reloads usi g TrailBoss (3.1 grains with 180 gr bear creek works well for .40 minor!) I think my max OAL with 124 gr Montana Gold JHP is 1.150" No feeding issues either. I've fired 95, 100, 115, 124, and 130 gr rounds all flawlessly. Haven't tried 147 grain rounds yet. Link to comment Share on other sites More sharing options...
FJR05 Posted August 27, 2012 Share Posted August 27, 2012 I've got the Storm Lake 40 to 9 conversion bbl in a M&P FS. I got it in case there was ever a problem getting 40 ammo for HD. It turns out it is totally reliable and more accurate than my buddy's factory M&P 9mm. POA/POI between 40/9 is a wash. No changes except putting in one bbl or the other and using the appropriate magazines. Highly recommended. John Link to comment Share on other sites More sharing options...
FightFireJay Posted August 27, 2012 Share Posted August 27, 2012 Oops, to clarify.... My only failure to Ejects was with underpowered 9mm using TrailBoss. However, max loads of TrailBoss in .40 will cycle the slide, keep pressures low, and make a super soft shooting .40 minor load. Link to comment Share on other sites More sharing options...
Aint No Rest 4 The Wicked Posted August 31, 2012 Share Posted August 31, 2012 So all you need is the barrel and magazine? Link to comment Share on other sites More sharing options...
FJR05 Posted September 1, 2012 Share Posted September 1, 2012 Yes, just the conversion barrel and the correct caliber magazine to go with it and you're ready to go. Everything else stays the same. John Link to comment Share on other sites More sharing options...
Aint No Rest 4 The Wicked Posted September 1, 2012 Share Posted September 1, 2012 Thanks Link to comment Share on other sites More sharing options...
rack&roll Posted September 1, 2012 Share Posted September 1, 2012 Just ordered a KKM conversion 40 to 9 for my 40 pro from SSS yesterday. Can't wait to get it! Limited minor. Should make a good steel gun, and cheaper to shoot...to boot! Link to comment Share on other sites More sharing options...
downhere2 Posted September 6, 2012 Share Posted September 6, 2012 I have been using a factory 9mm pro barrel in a 40 pro for more than a year without any issues. Link to comment Share on other sites More sharing options...
rack&roll Posted September 6, 2012 Share Posted September 6, 2012 (edited) Well, I probably should'a tried the 9mm KKM barrel from my 9L before I bought the conversion for my 40 Pro...but too late now. I just got it today, put on my TF +6 9mm extensions and springs, and I'm off to the range. Wish me luck! Edited September 6, 2012 by rack&roll Link to comment Share on other sites More sharing options...
rack&roll Posted September 30, 2012 Share Posted September 30, 2012 (edited) The KKM .40 to 9mm M&P Pro conversion barrel works great, and very accurate. I've shot 2 mini-matches with it and probably 300 rds practice with no malfunctions. All I could ask for...highly recommended. Edited September 30, 2012 by rack&roll Link to comment Share on other sites More sharing options...
JMIS Posted September 30, 2012 Share Posted September 30, 2012 I have been using a factory 9mm pro barrel in a 40 pro for more than a year without any issues. Same here Link to comment Share on other sites More sharing options...
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