Glock 21 .45 Conversion to 9mm?

[Fantasma]

I am trying to find out if it is possible to make a Glock 21 .45 into a 9mm or .40 and what are the steps.


Is that possible to do? can anyone direct me to somewhere where i can find this type of information? I searched on GlockTalk and i cannot find any specific information.

Thanks

[Librarian]

I can tell you a G17 9mm mag will not lock in the G21 mag well; flops around quite a bit.

I think, if that conversion is possible at all, it would be cheaper just to buy a used 9mm model.

[bohoki]

I can tell you a G17 9mm mag will not lock in the G21 mag well; flops around quite a bit.

I think, if that conversion is possible at all, it would be cheaper just to buy a used 9mm model.

it would be neat to have a 38 super glock i bet it would hold 19 in a normal magazine

i'm still waiting patiently for the magazine externtions from that crazy subgun maker

[rkt88edmo]

I can tell you a G17 9mm mag will not lock in the G21 mag well; flops around quite a bit.

I think, if that conversion is possible at all, it would be cheaper just to buy a used 9mm model.

I think librarian is right - you would need to either buy a G17 or buy a reloading setup so you can shoot your .45 cheaper (assuming it is ammo cost that is driving this conversion).

[Fantasma]

Hyy thanks guys, this sounds like a no. So my question is what type of gun can have multiple calibers? Like lets say it has .40 9mm and .357

OR what gun can have .40 and .357

I am looking for a gun that can have at least 2 different calibers is this possible?

[bwiese]

Glock 21 (45ACP) and Glock 20 (10mm) frames are identical.

If you have a G21 in 45ACP, you can drop on a G20 10mm upper (slide/bbl assy).

The 10mm G20 upper can also be fitted with a KKM Precision 40S&W bbl and perhaps a 357Sig bbl as well - may need to change recoil spring as well, not sure...


As to your general question above, many many guns in 40S&W can be changed to 357Sig just by dropping in a new bbl - or vice versa. This would include Glocks, the S&W M&P40/357, the Sig 226 in 40/357 and the SigPro in 40/357. The HK USP40 is an exception; lotsa folks tried 357Sig conversions and they didn't work, and HK never produced the full-sized USP in 357Sig. [The USP Compact is available in 357Sig and I believe a 40S&W conversion is merely a drop-in barrel but am not 100% sure.]

I believe later Sig 226s in 40/357 can also have a special BarSto 9mm conversion barrel; most? all? factory Sig 226s 9mm can't be converted to 40/357.

[FlyingPen]

Yup, the only thing with the Barsto 9mm conversion barrel for the P226 is that it often needs to be fitted by a gunsmith.

At that point, you're looking at a 1-3 month wait for the barrel, and with barrel fitting total cost is about $300 + 9mm magazines... ($60): $360... for $150 more you can just get a used P226 in 9mm.

[JeffM]

To add to what Gene said, there are 9mm barrels out there that are drop-in for some .40S&W and .357Sig pistols. The Glocks are the only ones I'm sure of but I'm sure there are others. I'll be looking for a good deal on a Glock 23 and a 9mm conversion barrel as soon as the IRS sends me the $600 it stole from the suckers who pay real taxes (thanks guys!).

I've also shot a Glock 20 with a .40S&W barrel fitted. With everything else stock it failed to feed about 10% of the time (Probably because of the extra length of the 10mm magazine). Good if you want to practice tapping & racking.

[cope113]

conversion

As far as I know the only thing that can go n a Glock 21 would be a .400 carbon. I saw an ad for a while back but don't remember where. I have a Glock 23 and 19 and can switch the uppers without a problem. I don't have the courage to just change the barrel.

[aplinker]

If memory serves... your Glock 21 can do 45acp, 10mm and .400CorBon.

Every .40 can switch to .357Sig

I know for certain the P226 can do .40, .357Sig with just a barrel swap, and 9mm with a barrel and mag swap. You don't need the barrel fitted if you buy the $130 version from Dragon Fire EFK (search for pricing, their website is high).

[FlyingPen]

I personally wouldn't get an EFK Barrel, lots of mixed reports on the quality of the crown and it also loosens up your slide to barrel fit. On the bright side, they do have good service.

While the Barsto is a bit more expensive and often requires fitting, it's actually even better than the OEM Sig Barrel.

From Bruce Gray, a well regarded Sig smith:

Howdy and welcome!

The EFK barrels are not up to the quality standards of the pistols they ostensibly fit and tend to have some quirks. I've long thought they made the best after-market pistol barrel you can buy for too much money at a gun show, but they aren't what I'd choose for serious use.

My friend Aaron is right about fitting and going back to the maker for satisfaction, but he might not be seeing what I do in your photo; your barrel crown is apparently eccentric and poorly done, about par for the course with this maker.

Most likely the rattle you mentioned is due to a fitting problem referred to as guide rod suspension, in which the end of the recoil spring guide rod is bearing against the barrel lower protrusion lug in battery.

This in turn causes the slide to be unsprung when closed at full lockup, and to thus feel loose. Other barrels, including factory barrels in worn pistols will also manifest this condition. It can be corrected by proper fitting & recrowning work, at which point you might be able to see how well it will shoot.

If it shoots poorly on the range or doesn't hold up, you might consider replacement with a correctly fitted BarSto. I wish you luck and hope this works out for you.

-Bruce

[odesskiy]

Versatility is the reason I sold off all my 9mm Glocks (17, 19, 26) and acquired G23 and G27 (will pick up a G22 with my Daddy Bush check). I orderered a Storm Lake conversion barrel for my G23 along with a 9mm trigger housing and a 9mm extractor. Seems that Storm Lake barrels have a pretty good reputation. I will be getting conversion barrels for the other two and they can simply share the trigger housing/ejector and extractor. But those parts are so cheap, each might get their own set.

If I am so inclined, I can also convert .40S&W Glocks to .357Sig with a simple swap of a barrel (factory or aftermarket).