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  #1  
Old 02-07-2010, 06:13 PM
hedgehorn hedgehorn is offline
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10mm to 9mm conversion

Good evening.
I am wanting to convert my Kimber Eclipse 10mm to a 9mm or a 40. I am tired of not being able to find my expensive 10mm brass and for that reason I don't shoot it. Can I just fit a new barrel or will I have to change the extractor and ejector or more? I am not new here but I haven't posted much either. Any help would be greatly appreciated, Thanks in advance
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  #2  
Old 02-07-2010, 06:44 PM
Alland Alland is offline
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Converting 10 to 40 should only take a barrel and probably a lighter recoil spring. Converting to a 9 would require a new slide, extractor and magazines as well.
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  #3  
Old 02-07-2010, 06:44 PM
Lunatic Lunatic is offline
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NOT a 9mm. A 9mm is small cartridge and the 40's breech face is larger, there maybe extraction issues. For the .40 yes, a barrel, .40 magazine, maybe lighter springs and a little fitting.
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Last edited by Lunatic; 02-07-2010 at 06:47 PM.
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  #4  
Old 02-07-2010, 06:51 PM
emptymag emptymag is online now
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Yeah, .40 should be fairly straightforward. I would guess a properly fitted barrel/link, lighter recoil spring, and a longer/tuned ejector (depending on what Kimber uses in their 10mm). I think you can use the same mags?
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  #5  
Old 02-07-2010, 07:44 PM
Auto Mag Auto Mag is offline
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It is quite a major undertaking but it can be done.!! You will have to change the complete upper receiver. Besides the barrel being the wrong caliber, the breech face is milled for a 10mm case. A 9mm case won't work because the extractor will be in the wrong place.

There will most likely be an issue of changing out the mainspring as a 10mm operates at significantly higher pressures than a 9mm.

Going from a 10MM to a 40 S&W will be much easier!!
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  #6  
Old 02-07-2010, 07:51 PM
hedgehorn hedgehorn is offline
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Thanks for the replies. I think a 40 is what I will go with here. Any suggestions on the barrel? Should I buy a drop in with a bushing?
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  #7  
Old 02-08-2010, 05:28 AM
richpetrone richpetrone is offline
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Conveting a 10mm to a 9mm

Quote:
Converting 10 to 40 should only take a barrel and probably a lighter recoil spring. Converting to a 9 would require a new slide, extractor and magazines as well.
I believe a major firearms mfg.,(I think it was Springfield) used the same slide for their 9mm and .40 S&W guns. The difference in the width of the cartridges is .030", which isn't a tremendous difference when compared to the 9mm and .45. Because the base of the cartridges are so close in size, when reloading for the 9mm, 40S&W, and the .38 super, the same shell plate can be used.

I took a 9mm slide and opened the breech face to accomodate the .40 S&W round, and now have a gun where I can switch barrels and mags from 9mm to .40.

You may be able to use your Kimber 10mm slide as is, and fit a 9mm barrel. It would be best to use a 9mm (long) ejector, and you may have to adjust extractor tension, but it should work. However, switching to a .40 S&W would be easier, and you may only need to add an extended ejector, and purchase new mags. The Mec-Gar mags with the spacer in the back worked very well in a 1911 .40S&W I once built.

Last edited by richpetrone; 02-08-2010 at 11:32 AM.
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  #8  
Old 02-08-2010, 08:30 AM
1911MasterSmith 1911MasterSmith is offline
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If you want to sell your 10mm barrel, 10mm mags, any NEW 10mm brass or 10mm factory ammo later, just PM me and maybe we can work out a deal.
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  #9  
Old 02-08-2010, 09:23 AM
George Smith George Smith is offline
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Quote:
Originally Posted by richpetrone View Post
I believe a major firearms mfg.,(I think it was Springfield) used the same slide for their 9mm and .40 S&W guns. The difference in the width of the cartridges is .030", which isn't a tremendous difference when compared to the 9mm and .45.

I took a 9mm slide and opened the breech face to accomodate the .40 S&W round, and now have a gun where I can switch barrels and mags from 9mm to .40.

You may be able to use your Kimber 10mm slide as is, and fit a 9mm barrel. It would be best to use a 9mm (long) extractor, and you may have to adjust extractor tension, but it should work. However, switching to a .40 S&W would be easier, and you may only need to add an extended ejector, and purchase new mags. The Mec-Gar mags with the spacer in the back worked very well in a 1911 .40S&W I once built.

Very good point. consider if the case is .030 larger the Left fixed side of the bolt face only needs to be .015 wider. The extractor takes up the slack on the other side. perhaps a different extractor labeled for 9mm and 40/10 would get you there.

Also consider a super which ends up being a 9mm slide too only needs to be .408 ish but colt routinely made slide that by the time you cleaned up the ejector is .420 so that is really close to what you need.

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  #10  
Old 09-20-2016, 08:53 PM
ForesterPumice ForesterPumice is offline
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Some conflicting information here.

I'm planning on using a 5" 10mm slide, converting it to 9mm.

I was told Kimber used the same size breech face for 9mm,.40,and 10mm. Can anyone confirm that?

I can't find the exact size of the casings at the breech anywhere, but I was told that instead of half a mm, it's actually just a .3mm difference, same as 9mm and .40'sw , those interchange just fine.

I got a Nowlin 9x21 5.35" barrel with a compensator hole at the tip. The price was great, $50, new. these are too expensive for me usually.

I have read that they will chamber 9x19 just fine, but not vice vers. Is there any modification needed to the chamber to improve reliability?

My plan is to use a high quality 9mm extractor hopefully I can find an oversized file to fit,, to help hold it tight to the breech face , with the tiny bit if slop. A 15-16# recoil spring, and that should do it.
15# strong enough for 9mm?

Looking for a tutorial on cutting the frame for Nowlin ramp. Found some for para ordnance ramp, not familiar with the Nowlin /Wilson ramp, but it looks good.
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  #11  
Old 09-21-2016, 08:47 AM
Cannibul Cannibul is online now
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Holy necro thread!

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  #12  
Old 09-21-2016, 09:00 AM
ForesterPumice ForesterPumice is offline
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Quote:
Originally Posted by Cannibul View Post
Holy necro thread!

I'm blaming google for the anthropology tread.

I hate these unresolved threads.


Btw, I checked, .40 and 10mm share the same base diameter.
Plenty of people have converted .40 sw to 9mm with an extractor, ejector, and spring change, so same deal with the 10mm. Might not be perfectly reliable, but it will work.

Glock people do it all the time with 9mm conversion barrels for glock 22's (.40 to 9mm).
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  #13  
Old 09-21-2016, 04:08 PM
Hairtrigger Hairtrigger is offline
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If you do the conversion and sell the parts your man card should be included with the parts

I am pretty sure he will not be allowed to own it any longer

Just a joke not meaning to offend
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  #14  
Old 09-21-2016, 05:22 PM
dakota1911 dakota1911 is offline
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I would probably do a new barrel/bushing in 40 S&W plus new recoil spring(s) and new mags. If the barrel "drops in" with no fitting and works well I would go buy lottery tickets. I would keep the old 10mm parts with the new 40 S&W parts. The new "convertible" pistol should be worth more on the market than the original pistol would have been.
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  #15  
Old 09-22-2016, 09:37 AM
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epj epj is offline
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It sounds as though you're planning to use a 9X21 barrel to fire 9X19 ammo. If so, you will be depending on the extractor to maintain headspace. I know it will work, but is that really what you want to do? If you're planning to shoot 9X21 ammo, then the plan has greater merit in my completely uneducated opinion.
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  #16  
Old 09-22-2016, 10:18 AM
ForesterPumice ForesterPumice is offline
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Quote:
Originally Posted by epj View Post
It sounds as though you're planning to use a 9X21 barrel to fire 9X19 ammo. If so, you will be depending on the extractor to maintain headspace. I know it will work, but is that really what you want to do? If you're planning to shoot 9X21 ammo, then the plan has greater merit in my completely uneducated opinion.
Might have to bail on the Nowlin barrel, unless I can the frame cut for it for less than 100. Probably going with an unramped 9mm.

I liked the idea of being able to shoot 9x21 and 9x19. Could not pass up a basically new Nowlin barrel for $50. Maybe I'll sell it.

I read about a special extractor specially made to fix that headspace issue for people wanting to shoot 40sw from a 10mm barrel, maybe there is a similar extractor. Either way, will definitely want a high quality extractor, to help with the tiny bit if slop at the breech face.
.
Also, I don't have the 10mm parts, building piece by piece, stripped slide. Eventually I will fit 10mm, and .40 barrels, once I get more unto reloading, and spend more time actually working and earning $, and less time tinkering.

Example, I spent 8 hours hand filing, then sanding, burnishing, decking a slide. I could have probably produced 300-500$ worth of glass or jewelry in that time and just bought a caspian frame. But I feel COMPELLED to work and tinker with these.

My first ever built was a few years ago, converting a kimar blank 1911 (someone bet me it was impossible ) to a chiappa 22 1911 (when they first came out). I eventually got a chiappa to copy, but mine was way better, I made my own extractor, made springs from music wire., had a barrel liner made, found the real slide,, mine was a huge hassle to build, and those chiappa s are nothing like a 1911 inside .but it worked much better than the real one. I still have it locked up in the basement.

I was surprised to find out it was perfectly to do that, and legal to build your own.

I did find that it is MUCH easier to build from a 60%:casting (only the mag catch drilled ) when you have a real 1911 to copy.

I hope more guns will have 80% frames become available, so far just glock, sig 228, 1911, ruger 59 but they seem to have disappeared. I would love to build a Walther p38, so simple design.

Imo, can't beat the 1911, I'm just a little bored with 45, and I want to try some new stuff. Maybe reloading will help, 45 is so expensive.

I'm hung over...that looks like a mess, better not post it. Deleting .
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