Mike21STI Posted February 26, 2011 Share Posted February 26, 2011 I'm thinking about starting to shoot USPSA and I currently have a 1911 in 9mm, however I want to shoot major and was thinking about buying an upper chambered in .40, can I easily interchange the two? do I have to change anything else aside from getting the new slide, barrel, bushing, magazines, firing pin, and block? Link to comment Share on other sites More sharing options...
mike cyrwus Posted February 26, 2011 Share Posted February 26, 2011 frame ramp must be the same. Im sure theres many old threads you can find some info in. Just do a search. Link to comment Share on other sites More sharing options...
GrumpyOne Posted February 26, 2011 Share Posted February 26, 2011 Probably not. It's more than likey like Glocks. You can turn a G35 into a G34 with a conversion barrel (that's a 40 to a 9mm), but you can't change a G34 into a G35 99mm to 40). Has to do with the barrel size, outside diameter of the 40 is a good bit bigger than the 9mm. You probably could get the slide milled to fit the 40 barrel, b ut you'd no longer have a 9mm, ever again. And it would be fairly expensive to have all that milling done. Cheaper and better to get another 1911 already chambered in 40. Link to comment Share on other sites More sharing options...
Cy Soto Posted February 26, 2011 Share Posted February 26, 2011 This may help answer your question: http://www.brianenos.com/forums/index.php?showtopic=123859&st=0&p=1399672&hl=9mm%2040&fromsearch=1entry1399672 Link to comment Share on other sites More sharing options...
Joe D Posted February 27, 2011 Share Posted February 27, 2011 What 1911 do you have? If it is a Kimber then you are good to go as they use the same breech face for both. Link to comment Share on other sites More sharing options...
Mike21STI Posted February 27, 2011 Author Share Posted February 27, 2011 I have an STI Sentry, I probably won't end up doing it because my 9mm 1911 is my IDPA gun of choice. Maybe I'll just run my Nighthawk .45 in single stack or limited 10 instead. Link to comment Share on other sites More sharing options...
whatsupglock Posted March 8, 2011 Share Posted March 8, 2011 I have an STI Sentry, I probably won't end up doing it because my 9mm 1911 is my IDPA gun of choice. Maybe I'll just run my Nighthawk .45 in single stack or limited 10 instead. I'm in the exact same boat. I've got an STI Trojan 9mm for an IDPA gun and I've been shooting it in SS as minor. I do have a SA in 45 acp and I'm thinking of running it in L-10. I just need to get set up to relaod 45 and I need some good 10 round magazines. Link to comment Share on other sites More sharing options...
Mike21STI Posted March 8, 2011 Author Share Posted March 8, 2011 I've had good luck with the Wilson 10 rounders in all of my 1911's in .45 (nighthawk, 2 Kimbers, 1 SW, 1 Dan Wesson) Unfortunately I parted with some of those mentioned but the Wilson mags ran great in all of them. their 9mm mags, not so much!!! haha... I haven't broken down to getting into reloading yet, although I definitely want to. Link to comment Share on other sites More sharing options...
steviesterno Posted March 9, 2011 Share Posted March 9, 2011 I'm in the same boat. All the while trying to come up with a perfect game gun, where I should really just be runnig a 1911 in l10 or ss. Next purchase is a loader though... Link to comment Share on other sites More sharing options...
TonyT Posted March 10, 2011 Share Posted March 10, 2011 I believe you will require a complete upper since the breech face of the 9mm is much smaller than the 40 S&W. Link to comment Share on other sites More sharing options...
Forrest Halley Posted March 10, 2011 Share Posted March 10, 2011 If you are going to shoot single stack or L10 with a 1911...why not use the .45 you already have? Looking at it this way you've go two guns that run. Forty single stacks are a difficult thing to get running or so sayeth the local GM. If you've got a .45 spend the money you would shell out for the upper and buy ammo/components. Link to comment Share on other sites More sharing options...
shooter57 Posted March 11, 2011 Share Posted March 11, 2011 I think you can go 40 to 9 not 9 to 40 because of the breach face. Link to comment Share on other sites More sharing options...
USCSBarney Posted March 13, 2011 Share Posted March 13, 2011 Been thinking of doing the same as mentioned and just talked to a local gunsmith who also shoots USPSA. From what I know and he informed me of, you can go from 9mm to 40 by opening up the breechface and changing barrels (and maybe extractor and ejector but that depends). Problem lies in finding a gunsmith to do it. He said most good smiths don't have the attachement to allow them to do the cut. Apparently it is several hundred dollars and most smiths don't invest in the part as widening the breechface is not something any of them do that often. You have to come in through the barrel bushing end to do the cut (according to him) and most cutters won't reach without the extension. Ultimate answer, not hard to do but takes that expensive gizmo few have. If anyone knows of a smith that can do it, please post them up. I would be one that would send them some buisness. Link to comment Share on other sites More sharing options...
bofe954 Posted March 13, 2011 Share Posted March 13, 2011 You'd think the extractor would be in the wrong spot if you just opened up the breech face. Is it just such a minor change that it doesn't matter? Link to comment Share on other sites More sharing options...
Carmoney Posted March 14, 2011 Share Posted March 14, 2011 (edited) Most everyone seems to have missed the original question--can you simply switch back and forth between separate complete upper assemblies, one in 9mm and one in .40? The answer of course is YES, as long as both uppers are correctly fit to the lower. Anybody remember this thread?? http://www.brianenos.com/forums/index.php?showtopic=26887&hl=armscor&st=0 Edited to add photo of my switch-top 9mm/.40 Armscor wide-body. All it takes to switch calibers is to simply pop out the slide stop, slide off the entire upper assembly as a unit, slide the new one on, and replace the slide stop. Takes about 10 seconds. Edited March 14, 2011 by Carmoney Link to comment Share on other sites More sharing options...
granderojo Posted March 18, 2011 Share Posted March 18, 2011 Try George at EGW-Guns. He did the opposite for us. We were having feeding problems w/Kimber SS in 9mm. George welded up the breach face (cut for.40 from Kimber) and recut them to 9 and the feeding problems went away. Mine would only feed Blaszer Alumn reliablely. Now, it eats anything w/no problems. He's a very nice guy to do business with in addition to being an excelent smith, machinist and custom gun builder. Check him and his web site out. Link to comment Share on other sites More sharing options...
Mike21STI Posted March 18, 2011 Author Share Posted March 18, 2011 Most everyone seems to have missed the original question--can you simply switch back and forth between separate complete upper assemblies, one in 9mm and one in .40? The answer of course is YES, as long as both uppers are correctly fit to the lower. Anybody remember this thread?? http://www.brianenos.com/forums/index.php?showtopic=26887&hl=armscor&st=0 Edited to add photo of my switch-top 9mm/.40 Armscor wide-body. All it takes to switch calibers is to simply pop out the slide stop, slide off the entire upper assembly as a unit, slide the new one on, and replace the slide stop. Takes about 10 seconds. Thanks Carmoney, thats exactly what i was looking to do. I was told by someone that I could just easily get a complete upper chambered in .40 and it would be good as long as it was fitted to the existing frame. I think I know what my next purchase is... Link to comment Share on other sites More sharing options...
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