Glock barrel help

PorP · May 5, 2019

Folks, did a search but it returned about every thread on the board.

Just bought my 1st glock, a 4th gen G21 chambered in .45.

I bought that specific model because I was told with barrel/ spring swap I could shoot 357 sig, 10mm and. 460 rowland.

Can someone tell me or post a link to the 357 barrel i would need, please.

I am hoping one of the glock-xperts can help this glock-tard to understand the lone/ alpha wolf cypher

Thanks in advance.

Sundazes · May 5, 2019

Paging Ammo Jon....

randyho · May 5, 2019

I think the usual progression is from 40. I have a 21 and the 20 slide I also have works flawlessly. I haven't seen a 357 sig option for the large frame glocks, though I admit I haven't looked.

PorP · May 5, 2019

randyho said:
I think the usual progression is from 40. I have a 21 and the 20 slide I also have works flawlessly. I haven't seen a 357 sig option for the large frame glocks, though I admit I haven't looked.

Wow, I hope that's not the only option! I have a vp40 tactical to shoot 40 and multiple kimber's for 45, I would never use a glock to shoot either.

If that's the case, maybe I'll just make it a permanent rowland.

ironpony · May 5, 2019

Maybe 400 Cor-Bon. 10 mm Glock may convert to 460 ??

PorP · May 5, 2019

ironpony said:
Maybe 400 Cor-Bon. 10 mm Glock may convert to 460 ??

From what I have read, I can use g20 barrels in the g21 that would get me to 357 and 10mm.

I have read about the 460 kits for the g21, 4th gen kit is Judy Moore expensive than the gen 3 kits.

platoonDaddy · May 5, 2019

I have a .460 Roland Lonewolf barrel for my G21 Gen 2 using the G21 slide.

For the 10m I use a G20 slide (wasn't required, just did for ID purposes) & barrel, of course plus magazines.

The Glock 21 can also be converted to
.50 GI
.400 Corbon
10mm
40 Super
45 Super
460 Rowland which is definitively the most powerful big-bore semi-automatic cartridge that can be used for regular-sized, compact and subcompact semi-auto production handguns (we are aware of the existence of other rather obscure handgun calibers like those the Wildey Magnums and the Desert Eagle use — those handguns don’t count)

.

https://gunnewsdaily.com/glock-20-vs-glock-21/

303_enfield · May 5, 2019

To go 40/357 you need a G20 upper (10mm).
https://www.glocktalk.com/threads/g21-conversions.1639685/#post-23622251

davsco · May 5, 2019

my thought (and experience) is it's too easy to mix up ammo with all the changes (and/or bring the wrong barrel/slide/ammo mix to the range which would suck), and the results could be pretty disastrous, and of course the different magazine and barrels aren't free either. so at the cost of <$600 each (and three mags included each gun), i just bought some extra glocks when i wanted a different caliber or sized glock.

you prob already know the 20/21 are larger frames (and i think slides) than their 9/40/357sig models so not sure how that affects interchangeability.

Ammo Jon · May 6, 2019

https://www.lonewolfdist.com/Detail.aspx?PROD=920321

I'd reach out to LWD, but the above might be a possible solution. Haven't heard of any 45ACP-357SIG conversion barrels. I used to have a bunch of conversion barrels, now I have a bunch of Glocks :lol2:

alucard0822 · May 6, 2019

Big jump between a .425(40/10mm) and .480(45/460rowland) rim, lots of slop aggainst the breech face, ejector and extractor going between those 2, there is a much smaller .033" difference between 10/40 and 9mm rims, and they often have issues without a slide and ejector swap. There is a chance either swap with a barrel/mag only could work, but it's far from certain. 460 can be epic, I built one on a 1911 platform, have to make sure your spring rates are right, and you are using a sufficient comp. Even when set up properly, full power ammo is brutal, although loaded to 45super velocities, it's still really powerful, but a lot more manageable on you, and the pistol.

PorP · May 11, 2019

Thanks for the replies, gents. Just getting back from travel.

Guess I'll go with Rowland on that one and pick up a G20 too.

PorP · May 11, 2019

alucard0822 said:
Big jump between a .425(40/10mm) and .480(45/460rowland) rim, lots of slop aggainst the breech face, ejector and extractor going between those 2, there is a much smaller .033" difference between 10/40 and 9mm rims, and they often have issues without a slide and ejector swap. There is a chance either swap with a barrel/mag only could work, but it's far from certain. 460 can be epic, I built one on a 1911 platform, have to make sure your spring rates are right, and you are using a sufficient comp. Even when set up properly, full power ammo is brutal, although loaded to 45super velocities, it's still really powerful, but a lot more manageable on you, and the pistol.

Understood and thanks. Being a noob, I was thinking they were leaving a little more meat on the barrel top compensate for the gap. Guess that's not the case.

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