[Teecher45]

Well, a little bump here for 2 reasons.
1) I'm very interested if anyone has any updates, especially since I own a Gen 4 21 and am interested in knowing if anyone has had any success with shooting the .45 Super out of a stock Gen 4 21?
2) I only need a 10mm/.45 Super a couple of times (or less) a year. Annually my father and I travel to Colorado to elk hunt and would ideally shoot a couple of mags through it to check for function then carry it hunting as a last resort type weapon. I probably could make a box of .45 Super last me forever and just shoot ACP the rest of the year.
So does anyone know if it a Stock Gen 4 21 would shoot a box of .45 Super without any ill effects?

[SDGlock23]

I can't answer your question, but in regards to function, there's no reason why the Gen4 wouldn't handle the .45 Super. Underwoods offers some .45 Super and says that it can be shot in the G21 but should have stiffer springs, and the Gen4 does have a stiffer spring than regular Gen3's. I would personally rather have a better supported barrel as well, but I'm not going to say it's a must because I don't know, I've only loaded .45 Super for use in my KKM barrel.

[Teecher45]

Ok SD, that sounds right. Thanks for your help.


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[SDGlock23]

Update: Yes it works, but again I do use an aftermarket barrel. I recently replace my G21sf with a Gen4 G21.

[Teecher45]

Thanks SD, sounds like It'll work fine, but want to be certain before I move on. Your saying you tried it in your Gen 4 G21?
If so, I'm guessing the barrel won't affect reliability, just accuracy?
I'm planning only putting a few rounds through my 21. It will only carry super rounds when bow hunting.

[SDGlock23]

I've shot the .45 Super in my G21 Gen4, but only through the KKM barrel. The stock barrel would work I'm positive, but might be harder on brass which isn't an issue if you don't reload.

[Teecher45]

Reload yes. Reload .45 Super, no.
I'll only be carrying it a couple of weeks a year. My 21 probably won't see a whole box of .45 Supers in it's lifetime. Just while bowhunting in Colorado.
Thank you for your help.

[NoJoy]

Originally Posted by gatorboy

I'll stick my nose in here also ) .

I use a 22# Wolff RSA in a G3 20 and have a G4 21 with stock RSA. The Wolff is considerably heavier.

Also remember the 10mm slides are heavy. The top three heaviest Glock slides in order is the 20, 24 and 29. So the 29 slide is heavier than the 21 slide. There are aftermarket RSA's for the G4's out already. You can get heavier dual recoil springs. Love reading about the 45 Super and plan on trying it in my 21 and M&P sometime soon. The 10mm is great but I like the idea of a 230 gr. 451" projectile @ approximately 1150 FPS.

Hey this is good info
Do you know how much heavier a G20 slide is compared to the G21 Slide? Is it a couple ounces heavier?

[vaquero aleman]

On the Glock website:

The G20 is listed as 27.69oz unloaded

The G21 is listed as 26.46oz unloaded.

They don't list component weight so I can only speculate about that.

And, we have to consider that the G20 barrel is thicker than the G21 barrel so I am assuming that the G20 barrel adds something to the equation as well.

This is my G21 factory slide with all of the components still installed but the barrel and recoil assy removed. It weighs 1lbs 3/4oz like that.

Can someone else weigh their G20 slide and post it here?

[WeeWilly]

I only have Gen 3's, still don't have a Gen 4.

G21 - Assembled slide (no barrel or RSA) - 16.8
G20 - Assembled slide (no barrel or RSA) - 17.7

G21 - Barrel only - 4.0oz
G20 - Barrel only - 4.7oz.

My Glockmeister 22/24lb SS RSA weighs .7oz more than stock RSA.

All weighed on a cheap postal scale so YMMV.

[NoJoy]

Cool thx. Looks like the G20 slide is almost an ounce heavier. Barrel is heavier too, but it is a little thicker which make sense. Every bit helps when dealing with higher power loads.

[gatorboy]

Originally Posted by NoJoy

Does anyone know what the weight of the outer recoil spring is on the duel recoil spring setup of the Gen 4 21? I wonder if it is the same weight of the Gen 4 20. If the Gen 4 20 can support full power 10mm loads, then the Gen 4 21 should be able to shoot 45 Super without any mods. (Unless you want to swap out the stock barrel for a Lone Wolf or KKM)

I'm not sure but the springs in my G4 22 are much stronger than those in my G4 21.

Originally Posted by NoJoy

Cool. If the recoil spring set-up is not the same in the Gen4 21, then I should be able to swap out the 21 duel recoil spring for the 20 duel recoil one right?

Exact dimensions so they can be swapped. The 22 RSA is just shy of the length of 21 and 20 RSA. The 20 and 21 RSA's will work in the 22 however. The inner spring guide sticks out a bit but will function 100%.

[gatorboy]

I'm going to try it out soon. I'll wait until I know if 20 springs are heavier, if they are I'll order the 20 RSA. If not, wish me luck! I may put some exhaust tape on inside of slide to add a bit more weight either way.