G21 to G20/40 conversion

[JGSFAB]

I've read alot of extractor this and ejector that. A cheap 10mm barrel came up so I said #whynot. First mag down zero malfunctions on 180gn HPs...

Read More

 

[Deavis]

Im doing the exact same thing with a G41. Found a deal on a 10 barrel. Grabbed some mags and some ammo on sale at BiMart. I need brass though!

 

[JGSFAB]

Im doing the exact same thing with a G41. Found a deal on a 10 barrel. Grabbed some mags and some ammo on sale at BiMart. I need brass though!

Starline was $20/100 @ midwayusa.

 

[Deavis]

At this point the .44/rd bimart sale stuff doesnt look to bad!!!

 

[arakboss]

I've read alot of extractor this and ejector that. A cheap 10mm barrel came up so I said #whynot. First mag down zero malfunctions on 180gn HPs...

View attachment 1422780 View attachment 1422781 View attachment 1422782 View attachment 1422783

Nice, what was ejection pattern like?

 

[JGSFAB]

Scattered most behind, I blame new barrel. I had one go forward then I think most ended up over head landing 6 o clock. 45acp usually throws 4-5 but I do find 6s. The distance is impressive.

 

[Stomper]

Nice, what was ejection pattern like?

Said the nurse to the sperm donor…..

 

[Stomper]

Scattered most behind, I blame new barrel. I had one go forward then I think most ended up over head landing 6 o clock. 45acp usually throws 4-5 but I do find 6s. The distance is impressive.

Are you using the stock G21 recoil spring?

 

[JGSFAB]

At this point the .44/rd bimart sale stuff doesnt look to bad!!!

I'm burning hand me down powder/primer but no that doesn't sound bad. I doubt large hollows are that cheap.

 

[JGSFAB]

Are you using the stock G21 recoil spring?

Yep. I might try a G20 but it functions.
Eventually I'd like a complete seperate G40 slide/spring/barrel.

 

[RX-79G]

Yep. I might try a G20 but it functions.

They're the same spring. The difference is the slide mass.

 

[JGSFAB]

They're the same spring. The difference is the slide mass.

Any idea which is lighter? 21 vs 20

 

[RX-79G]

Any idea which is lighter? 21 vs 20

21. 10mm has more recoil, so it has a heavier slide to tame that recoil. Between the thicker barrel and heavier slide, the G20 is 40grams heavier overall.


All full size Glocks use 17lbs. recoil springs.

 

[JGSFAB]

Well I added an 40gram optic so its closer to balanced I guess lol.

 

[The Heretic]

I'm burning hand me down powder/primer but no that doesn't sound bad. I doubt large hollows are that cheap.

recoil gun works just got some .40 Gold Dot PD trade in ammo for 60 CPR

the nice thing about .40 is it is sometimes cheaper than 9mm and you can find deals like this. I got most of my .40 ammo from sellers who were selling due to PD/etc. switching to 9mm

re: extractor - I have read that eventually the .40 ammo will cause issues with the extractor if the slide was for a different caliber (e.g., 45). I haven't heard the same thing for 10mm in a .45 slide, so I have to wonder how much validity there is to that?

I won't go this route as I already have six .40 SIGs and I am not a huge fan of 10mm compared to .45 ACP