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Old 02-19-2005, 09:08 PM   #1
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40 S&W to 10mm conversion?

What would be involved in converting a 40 S&W pistol to 10mm, is it considered practical at all?

I have my eye on a STI Trojan 6.0. They are available in 40 S&W, but not in 10mm. It would be very cool if I could get one and then have some gunsmith convert it to 10mm, but I may just be dreaming. (Are the magazines different, would a 10mm magazine even fit in the well?) Incidentally, I have seen a STI Trojan 6.0 made at the factory in 45 Super! It seems to me if the gun can handle 45 Super, it surely should be able to handle 10mm Auto.

I want a 10mm with a 6-inch barrel, but I don't see anybody making them that way. That's what led me to look at the Trojan.
 
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Old 02-20-2005, 08:29 AM   #2
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Tony, you should call STI, they may be willing to accomodate your request.

To convert the 40 S&W to 10mm all you would need to do is ream the barrel chamber to the correct depth, upgrade the recoil spring to 22-24 lbs and change out the follower in the magazines. (The magazines are the same)

Piece of cake.

There are 6" barrels on the market, check out Schuemann or Barsto. I recently ordered a Schuemann 6" .40S&W barrel, and had it fit to a Caspian 6" slide. I ordered a chamber reamer from Brownells. I talked with Wil Schuemann about reaming out the AET barrel, he said it wouldn't be an issue.

I know Baer makes 6" pistols, you might be able to special order a 10mm. Likewise SVI-Infinity would be a good place to look.

Otherwise, I have a Glock 20, they offer a 6" barrel, and I've heard Lone Wolf is offering a 6" slide (fairly expensive).

Good luck with your project.
 
Old 02-20-2005, 12:09 PM   #3
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You might need new mags as some 40 mags have a block out plate for the shorter 40 cartridge. You can have the chamber reamed or replace the barrel (then you have a switch caliber gun!). Go to this site for more info on how to set up a 1911 in 10mm.
http://www.geocities.com/mr_motorhead/10tech.html
 
Old 02-22-2005, 07:59 AM   #4
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STI Trojan 10mm

Quote:
Originally Posted by kjhoren
Tony, you should call STI, they may be willing to accomodate your request.
Nope. I emailed them, but they said bluntly that it's not available in 10mm. No further explanation given. (They don't list a 45 Super on their website either, but they obviously made at least one since I've got it.)


Quote:
Originally Posted by kjhoren
To convert the 40 S&W to 10mm all you would need to do is ream the barrel chamber to the correct depth, upgrade the recoil spring to 22-24 lbs and change out the follower in the magazines. (The magazines are the same)
Sounds good. I've just never had any custom 1911 pistol work done before, and I'm not sure who I should turn to for something like that.


Quote:
Originally Posted by kjhoren
I know Baer makes 6" pistols, you might be able to special order a 10mm. Likewise SVI-Infinity would be a good place to look.
I've tried looking at the SVI website and their "gun builder" program, but I was quickly overwhelmed by the many options, some of which were unfamiliar and poorly explained. Annoyingly, they actually lacked some options I was interested in.


Quote:
Originally Posted by kjhoren
Otherwise, I have a Glock 20, they offer a 6" barrel, and I've heard Lone Wolf is offering a 6" slide (fairly expensive).
The story I heard is that Lone Wolf made very few of those for 10mm and most of them for 45 ACP. The 10mm ones sold out in a flash while they are having trouble moving the 45 ACP model. Go figure.
 
Old 02-26-2005, 06:38 AM   #5
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10mm Conversion

I just got my Para-Ord P-16/40 back from the gunsmith (Hunter Custom Guns) after having it converted to a full 10mm. :P
He reamed the barrel, changed the hammer and recoil springs, and installed a square bottom firing pin block. Para-Ord at one time produced a 10mm and the magazines work well with the full round as long as the cartridge is kept a 1.26".
Cost of the conversion, including shipping, test ammo (factory) and re-stamping the barrel was $240 and change. :lol:
I had it at the range yesterday and it functioned perfectly with both factory ammo and my handloads.
The magazine would be the most concern on other brands.
Good Luck
 
Old 02-27-2005, 08:31 AM   #6
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Conversion of a .40 Mauser M-2 to 10mm ...


Speaking about conversions, a poster on THR forum claimed he was able to "convert" a .40S&W M-2 to 10mm.

It started when he discovered that the M-2's .40 mags will accomodate the longer 10mm cartridge if a block or plate in the rear of the mag is "tapped out" (apparently its removable). The block was in there to help fit the .40 & 357Sig cartridges, as the M-2 mag was actually designed for the .45acp's length, with the lips modified to hold a .40-width case, which means it works for the 10mm too. And rather than make separate .40/357 mags, Sig just inserted a block in the .45 mag.

After that, the poster had the barrel reamed to 10mm and he was in business.
 
Old 02-27-2005, 09:17 AM   #7
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KoolTurtle,
Who did you have ream your barrel?
 
Old 02-27-2005, 12:19 PM   #8
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10mm Conversion

The gunsmith was Bob Hunter of Hunter Custom Guns. Bob was suggested by Para Ordnance customer service. He is a long time pin and steel shooter.
His website is: http://www.huntercustoms.com/ and he has somewhat of a backlog right now. Since hunting season is over and match schedules haven't started yet, you might have some success getting in to him.
KoolTurtle
 
Old 03-04-2005, 09:38 PM   #9
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If you're still looking for recommendations on a gunsmith to do this, I had Doug Jones in Detroit, MI ream an STI out to 10mm for me. Cost was under $50 with shipping both ways. Sent him the top half and had it back in 2 days. The gun ran great when I didn't screwup at the reloading bench.
Scott
 
Old 03-11-2005, 09:49 PM   #10
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I sent my P16.40 to Nowlin for installation of his 10mm bull barrel, his ProMatch 203 Action Kit, and a Sprinco compound recoil rod. Nice work. Runs good. http://www.nowlinguns.com/merchant2/merchant.mv
 
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