SMSI Posted November 15, 2011 Share Posted November 15, 2011 What is involved is switching from a 40 bull barrel to a 9mm bushing? is this tricky or generally easy? inherent problems? Link to comment Share on other sites More sharing options...
warpspeed Posted November 15, 2011 Share Posted November 15, 2011 Whole new top end - Slide, extractor, firing pin, firing pin stop, barrel & bushing. Don't forget sights too. Ejector on the frame may need to be changed too. Link to comment Share on other sites More sharing options...
yoshidaex Posted November 15, 2011 Share Posted November 15, 2011 Warp is right on the list of components. Don't forget your mags too. The ribs on a 40 mag are too shallow to allow proper stacking of 9mm rounds. Link to comment Share on other sites More sharing options...
D.Hayden Posted November 15, 2011 Share Posted November 15, 2011 If it's an SVI.. going from 40 S&W to a 9mm, bull barrel to bull barrel Extractor Breech face Barrel Mags Link to comment Share on other sites More sharing options...
SMSI Posted November 15, 2011 Author Share Posted November 15, 2011 what is the deal with changing the breach face? gunsmithing required? does an interchangable face affect function? thanks for the info. Link to comment Share on other sites More sharing options...
392heminut Posted November 15, 2011 Share Posted November 15, 2011 what is the deal with changing the breach face? gunsmithing required? does an interchangable face affect function? thanks for the info. SVI slides have an interchangeable breachface that can be changed without gunsmithing experience. You have to go in through the firing pin hole with an allen wrench to remove a hollow screw that retains the breachface, then remove the breachface and reverse the procedure to install the different caliber breachface. I believe SVI has a patent on this and it is only available on their slides. Link to comment Share on other sites More sharing options...
D.Hayden Posted November 15, 2011 Share Posted November 15, 2011 Takes maybe 10 minutes to change everything... you would never know it wasn't shipped from the "factory" that way.. Link to comment Share on other sites More sharing options...
kimberacp Posted November 15, 2011 Share Posted November 15, 2011 what gun do you have? Other than SVI or a Kimber model, you would have to buy a new slide for the change. SVI, luckily has the interchangeable breechface and the Kimber 9's or the 10mm models, share the same breechface dimemsions. So I have been told. But you can check the forum here and see that other have done the swap with the Kimber guns. Link to comment Share on other sites More sharing options...
pjb45 Posted November 15, 2011 Share Posted November 15, 2011 Ok, The diameter of the 9 mm and 40 S&W are different. Typically, slides are made for only one caliber. So for almost all slides except those made by SV are for only one caliber. As others have stated, normally a caliber change involves a new slide, barrel, and extractor. You need to make sure the cut on your frame/barrels is the same; W/N or C/P/L. You will have to get the barrel, frame, and slide fitted to work properly. This generally means doing nothing to the frame. Changing the frame could alter the fit of your 40 slide. SV is an engineering anomaly. Sandy, an engineering savant, has devised as way that only requires the changing of the breech face and fitting a new barrel. Possibly extractor too. Link to comment Share on other sites More sharing options...
SMSI Posted November 15, 2011 Author Share Posted November 15, 2011 Thanks for all the info. its an SVI i'm looking at, and the interchangable breechface is a new one on me. Learn something new every day, no matter how old I get. Link to comment Share on other sites More sharing options...
Carmoney Posted November 16, 2011 Share Posted November 16, 2011 Ejector on the frame may need to be changed too. Ejector should be same for 9mm and .40. Link to comment Share on other sites More sharing options...
Rob Boudrie Posted November 16, 2011 Share Posted November 16, 2011 Thanks for all the info. its an SVI i'm looking at, and the interchangable breechface is a new one on me. Learn something new every day, no matter how old I get. You will generally want to have an interchangeable breechface fitted (just a bit on the bottom so there is no little bump where it meets the slide) but, once fitted, it may be changed using a 1/8" allen wrench and no gunsmithing skills are required to change them. The retaining screw is made by SVI, and you won't find it elsewhere, so I suggest keeping a spare. The firing pin actually passes through the retainaing screw as shown in this photo: http://www.sviguns.com/4007.php Ejector should be same for 9mm and .40. The Infinity 40 and 38super/9mm ejectors are slightly different, however, I expect one could get away with a bit of cross functionality. Link to comment Share on other sites More sharing options...
D.Hayden Posted November 16, 2011 Share Posted November 16, 2011 Ejector should be same for 9mm and .40. Yup.. no problem here on mine Link to comment Share on other sites More sharing options...
wide45 Posted November 16, 2011 Share Posted November 16, 2011 Thanks for all the info. its an SVI i'm looking at, and the interchangable breechface is a new one on me. Learn something new every day, no matter how old I get. SVI has been doing the changeable breach face for several years now, but an older gun might not have this feature. Link to comment Share on other sites More sharing options...
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