gregshin Posted December 3, 2014 Share Posted December 3, 2014 I have an opportunity to buy a new 2014 build STI 2011 Marauder in 40cal but I don't shoot or care for USPSA and all that stuff. Can I swap in a 9mm STI bushing barrel into it? Are the breech face's different on the STI slides for 40 and 9? I'm pretty sure I will have to change the ejector as well which i can do myself. Anything else i'm missing or will have an issue with? Maybe also change to a different extractor? Of course recoil spring as well too. Link to comment Share on other sites More sharing options...
Tripod Posted December 3, 2014 Share Posted December 3, 2014 40 breech face will not work for 9mm. Recommend complete top end for 9mm conversion. You will also need different magazines. ejector will need changed out as well. Link to comment Share on other sites More sharing options...
hdgun Posted December 4, 2014 Share Posted December 4, 2014 (edited) Fit a 9mm barrel. Tighten the extractor. Get a 9mm mag and go to town. Ejector is the same as 40. There is a difference in the breech face but it should run just fine. I have several 1911 40 breech faced guns that I run 9mm barrels. Edited December 4, 2014 by hdgun Link to comment Share on other sites More sharing options...
bountyhunter Posted December 4, 2014 Share Posted December 4, 2014 (edited) I have doubts that 9mm would extract reliably from a 2011 with a .40 breech face. The extractor (even if bent enough to get good tension with round in the barrel) won't hold tension as the case extracts. The 9mm case is tapered and as it comes out it will twist and get loose. The bottom line is that extra gap between the edge of the case and the rim on the breech face won't let the extractor hold tension as the case is extracted all the way out. Edited December 4, 2014 by bountyhunter Link to comment Share on other sites More sharing options...
Service Desk Posted December 4, 2014 Share Posted December 4, 2014 I have an STI 2011 that was originally .40 S&W .....changed the barrel, tightened and tuned the extractor, then loaded a new 38 Super mag with 6 Supercomp rounds. All functioned perfectly and shot into an acceptable group at 25 yards. That was about 20k rounds ago.... I now shoot Supercomp and 38 Supers in that gun. Link to comment Share on other sites More sharing options...
Bob DuBois Posted December 4, 2014 Share Posted December 4, 2014 Some will some want but I'd give it a try. Barrel and little more tension on extractor along with 9mm magazine should work. Unless the Marauder is a Super buy may be better purchasing a 9mm pistol. Link to comment Share on other sites More sharing options...
DRichardson Posted December 4, 2014 Share Posted December 4, 2014 I know there not known for outstanding quality and reliability overall, but kimber uses the same slides for 9mm, 38 super, 40, and 10mm guns. It should work fine, but isn't really the "right" way to do it. I'd give it a shot, STI slides are fairly consistent from what I've seen so if you do have to go to a 9mm slide the barrel may work if it was fit to the 40 slide. Link to comment Share on other sites More sharing options...
jcc7x7 Posted December 5, 2014 Share Posted December 5, 2014 (edited) Use one with an Aftec 38sc/ 9 extractor for both 9 and 40. One spring comes put with the 40. Edited December 5, 2014 by jcc7x7 Link to comment Share on other sites More sharing options...
krazykj03 Posted December 8, 2014 Share Posted December 8, 2014 listening, i heard you should just do a whole complete slide for a 9mm and also magazines Link to comment Share on other sites More sharing options...
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