Hi, new to post, was just thinking what if, a 20 to a 21? Seems to me if you have a 21 (complete slide,barrel,spring) and place it on the 20 frame then use 21 mag and it might work? Might save on some ammo cost. Na like the 20 to much....

Glen2785, Welcome to 10mm Talk!

I know some guys who have converted their G-21's to 10mm and they are having some fun with them.

For me I only have the G-29 but have the Stom Lake 10mm and 40S&W aftermarket barrels with conventional rifling, also the Wolff Guide Rod system and Springs kits.

Good luck, have fun here and be safe!

I made a successful conversion from .45 - 10 mm with my 3rd Gen G21.

The components I used were:

- KKM .45 ACP : 10 mm Conversion Barrel
- Glock OEM 10 mm Magazines
- SS Guide Rod
- 22 lb. Recoil Spring

The guide rod and recoil spring were optional. Since the excess metal on the G20's slide is well ahead of the firing chamber, I figured it's a mass thingy. I thought the stiffer spring might compensate for the G21's somewhat lighter slide. At any rate, it works.

The conversion barrel's steeper feed ramp was a little picky about ammo. The square-nosed and polygonal-nosed ammos would occasionally fail to feed, whereas the bulbous-nosed ammos, like Double Tap's 135 grain Noslers feed just fine. The latter is my favorite 10 mm ammo!

My last three trips to the range were 100% free of any problems.

What a hoot, having my big, gentle kitten of a .45, sounding off like a lion!

The rig came in at about 1/2 the cost of a new G20, all fees considered. A used 10 mm would be hard to come by in my market--mine is the only 10 mm I've seen at my range! .45 ACP and .40 S&W rule in my neighborhood...

While it's fine for range play, I'd recommend a dedicated 10 mm for carry or hunting.

I think 10 mm is the bee's knees!

--Ray

Hey gang,

I think this is my 3rd post on the forum.

Im a HUGE 10mm fan!! I've carried a GLOCK 29 off duty for over 8 years. What's killing me is the cost of 10mm ammo. A few questions:

1) Anything I 'out to know about the KKM 10mm to .40 Short & Weak GLOCK 29 barrel conversion? My dept. issues GLOCK 22s so I get X ammount of .40 Short & Weak.

2) I REALLY like CO Steve's longslide. Beautifull!! I shoot combat and would love a 5.2" longslide Tactical. Is LONEWOLF still on the ball with their slides?

My goal is to purchase a 21 (my dept. also gives us te option of carrying a 21 if we purchase the weapon) and get a 20 longslide when one comes out.

JR's now offering a threaded G20 barrel...wlll be offering a compensator within the next couple of weeks. I'd much prefer a threaded, compensated barrel to a longslide, but that's just my preference.

Problem with the 10mm conversion of the G21 is that there is no extractor tension on the 10mm case, due to the difference in extractors. Lots of reports of failures to extract with the conversion barrels.

The problem with going from a 10mm to a 45 cal is that the 10mm breachface isn't wide enough to fit the 45 case so going from 45 to 10 is doable but going the other way isn't.
JR at Lone Wolf has the G21 tactical length (5.3") and the G21 Long (6") slides in stock and the G20 versions are due in the next month or two. I'd be interested to see if a KKM 45-10MM conversion barrel would work in their 45 slides without the extraction concern that the stock Glock slides have. I'm guessing that they might have issues because JR patterned his breachface and extractor from the Glock slide.

This post has been edited by COSteve: December 18th 2008 8:14 PM

When I had my KKM .45 - 10mm Conversion barrel I had a lot of fte. I worked with a couple of guys on Glock Talk that had them and changed springs, etc and could never get it 100%. Just my two cents.

Any word if JR's G20 slides are still due out soon?

I talked to JR a few days ago on a G24 project I'm considering and he told me that the G20L and T slides finely should be in late March. He thought he had them ready to go in January but during the QC of the test articles he found a machining error so he had to get his machine shop to correct that before he made his order.

CO Steve,

I am not yet a Glock owner, but will be buying one soon. The Glock 20L you have pictured in this post is an amazing looking pistol and is exactly what I'm looking for. I am quite ignorant about differences between Glock frames, so my questions may seem a little silly.

What is the best way to end up with a Glock 20L like yours:

Buy a G20 and find a 6" slide and barrel for it, or can you buy a G24 (6" .40 S&W) or a G35 (5.3" .40 S&W) and buy a 10MM barrel and drop it in?

You refer to a "JR" in your post; is he from Lone Wolf Distributors? I checked that site and couldn't find a 6" 10MM slide.

I very much appreciate any help that you, or any of the other members, can give me. Thanks!

Sorry for the delayed response as I've been out of town for a few weeks.

First, a quick primmer is in order. The 45acp and 10mm Glocks are large frame versions and not compatible with the std frame 9mm, 40s&w, or .357sig versions. Therefore, you must start with either a G20 or G21 frame. Either frame will work as they are identical including the ejectors. Its the slide and magazines that determine if its a 45acp or 10mm.

JR is the owner of Lone Wolf Distributors. When I last talked to him in early April, he said that the G20T (5.5") and G20L (6.0") slides would be coming out shortly. I haven't talked to him recently as I only got back last night so I don't know where he is on the schedule. Give him a call and he can let you know where things stand. He did say that the 10mm slides would not have the lightening hole in the slide like the G21 has so that is a good thing for those who want a solid slide like I have.

So, basically, if one already has a large frame Glock, then all you'd need is a G20T or G20L slide and barrel (and a G20 extractor if you own a G21). You could take the parts out of your existing slide and use them in your G20T/L slide or you could get a complete set of parts for it so you can still use your stock slide. Asyou don't have a large frame Glock, then you need to buy either a G20 or G21 frame or complete pistol and then add the new top end including barrel and mags as necessary.

This post has been edited by CO Steve: May 2nd 2009 7:26 AM

Here's a ?, will a G21 mag work with 10mm in a G20? Feed lips might be a little wide, but I was thinking, since they are not making the 20+ rnd mags for the 10mm can you convert/use a .45?
MikeH

I'm betting that all you need to do is get the KRISS Mag extension and put it on your G20 mag using your G20 follower. Check them out HERE.

You are right, you can switch uppers of the G20/G21. I have a G20 upper that I swap on my G21. Of course you have to go with appropriate magazine.

is CO Steve around still?

Didnt know tens were still this popular

I've done this conversion as well and I've had pretty good luck. (I traded several PM's with COSteve in the process, which was very helpful to me).

I started off with a NIB Glock 21SF.

I bought a Lone Wolf G21L slide, which accepts a 6" barrel, and a KKM 45-10mm 6" barrel (I also got a Lone Wolf 6" .45ACP barrel to shoot .45 through the same slide).

I took all of the small parts from the factory slide and installed them into the LW slide, then put a set of adjustable night sights on it.

I will say that, now they have the dedicated 10mm slides, that might be a better way to go if you just want to shoot 10mm and either keep your .45 slide together to use it or just not shoot .45. I wanted to shoot both through the 6", plus I shoot lead reloads through the .45 so I wanted the conventional rifling of the LW barrel also. I also bought some orange "training" basepads for the 10mm mags to differentiate between the 10 and .45 mags.

Once I got it together, I shot some 10mm through it with the stock guide rod and I felt it needed to be a little heavier due to the harsh recoil. I had some springs laying around and ended up using a 24# spring on a LW stainless guide rod. It ended up working just fine, even the few rounds of .40 I put through it. The extra power recoil spring also came with an extra power firing pin spring. I put that in, and coupled with the 3.5lb connector, it feels about like a stock Glock trigger.

The 10mm does have some inconsistent ejection... some of them will go straight out, some of them will go back to my 5 or 6 oclock, and I've had a couple hit me in the face. The .45's are very consistent, usually falling just to the right of my feet.

I have put close to 600-700 rounds of 10mm through it and it has not run 100%. I have heard others having problems with extraction. I've only had two malfunctions of that nature, and one of them I was deer hunting and laying prone while shooting (I can say with confidence that it was likely due to limp-wristing) and the other was near the end of a "non-cleaning" streak of a couple of hundred rounds. More often, the 10mm barrel misfeeds by the rounds hanging up while feeding from the magazine, most often slamming into the hood of the barrel and jamming the slide from closing. I have started cleaning the barrel after each range session and it has been running better. Steve was absolutely correct when stating that the match chambers of the KKM need to be kept clean. I have not modified my barrel in any way. It might have just needed some break in time, as I have not had any type of malfunction with it in the last hundred or so rounds (most of which were testing reloads), and I have not had any malfunctions with the .45 barrel.

Anyway, here are my pictures:













Thanks again for your help COSteve!

This post has been edited by AJE: February 5th 2010 4:41 PM

this is what i'm trying to do, conversion.
it's highly possible. mine runs 100% consistantly-after the first round has been loaded.
brainstorm: i was about to say it runs full mags but i'm working up loads so i only load 4 rounds at most. maybe it will load the first round consistantly if i fill the mag!
oh joy! a project that won't cost money and waste my time while it's in transit.
if i load some rounds today i could go to the range tomorrow.
crap! i have to drive to austin in my e46 cabrio w/o the family
maybe next week then.

as COSteve suggested, i 'took the edge off' the top of the chamber between 10 & 2 and had zero failure to chamber from the mag, in my garage.
i can't claim success yet-hoping for range time at lunch, but it sure seems possible.
another reason i think i may be having failure to feed is the squared off nose 180s i'm shooting.
can anyone recommend a different shaped 180 on 40/10, on the cheap side as i'm a first-class cheap bastid?
tia
michael

after doing as COSteve suggested on the 10-2 on the barrel hood i have success.
i was able to fire, 5 at a time, from a mag and a locked slide, 26 rounds.
my only problem had been getting the first round from the mag and into the barrel, but i was able to do it five times today.
now for more loading and hopefully repeated results.
i will still be adding a g21 lci & parts.