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Oh. My. Glob. 10mm is fun...

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UC_Guy 1971

Elite
So I went to the range today. I was finally able to throw some 10mm down range.

I have a Glock 21. I picked up a 10mm conversion barrel and guide rod/spring.

It was a little spicy, but I liked it. I even ran some .40 S&W through it just to see how it would go.

From my G21 10mm hits about 3" high. Where the .45 is POA/POI. The only cycling issues I had were with the .40. Even then it wasn't bad for plinking.

Time to seek out a 10mm. Who makes one in a 1911 format, with a rail and ready for a red dot.
 
UC_Guy 1971 said:
So I went to the range today. I was finally able to throw some 10mm down range.

I have a Glock 21. I picked up a 10mm conversion barrel and guide rod/spring.

It was a little spicy, but I liked it. I even ran some .40 S&W through it just to see how it would go.

From my G21 10mm hits about 3" high. Where the .45 is POA/POI. The only cycling issues I had were with the .40. Even then it wasn't bad for plinking.

Time to seek out a 10mm. Who makes one in a 1911 format, with a rail and ready for a red dot.
Click to expand...
20mm is fun, but…try a real magnum sometime if you really wanna have some REAL fun…;)

Dan Wesson, I believe makes a railed 10w/optics cut; perhaps Kimber as well. RIA makes a doublestack railed 10mm, but no optics cut…however, at under $900, you could get it cut for less than most other options.

By the bye: .40 in a 10mm isn’t a particularly good idea. The round doesn’t headspace correctly, and you’re asking for a kaBoom.
 
UC_Guy 1971 said:
So I went to the range today. I was finally able to throw some 10mm down range.

I have a Glock 21. I picked up a 10mm conversion barrel and guide rod/spring.

It was a little spicy, but I liked it. I even ran some .40 S&W through it just to see how it would go.

From my G21 10mm hits about 3" high. Where the .45 is POA/POI. The only cycling issues I had were with the .40. Even then it wasn't bad for plinking.

Time to seek out a 10mm. Who makes one in a 1911 format, with a rail and ready for a red dot.
Click to expand...
I have a Sig P320 X10 with Holosun and a Glock Gen5 G20MOS... both have optics and rails and are so much fun
 
UC_Guy 1971 said:
So I went to the range today. I was finally able to throw some 10mm down range.

I have a Glock 21. I picked up a 10mm conversion barrel and guide rod/spring.

It was a little spicy, but I liked it. I even ran some .40 S&W through it just to see how it would go.

From my G21 10mm hits about 3" high. Where the .45 is POA/POI. The only cycling issues I had were with the .40. Even then it wasn't bad for plinking.

Time to seek out a 10mm. Who makes one in a 1911 format, with a rail and ready for a red dot.
Click to expand...

Tanfoglio Defiant Gold Match OR​

www.athlonoutdoors.com

New in 10mm: Tanfoglio Defiant Gold Match OR

Fans of the big 10mm just got a new ride. The Tanfoglio Defiant Gold Match OR, imported by Italian Firearms
www.athlonoutdoors.com www.athlonoutdoors.com
1713191374595.png
 
With the option of getting a 10 barrel for a g41 (I know you have the g21) there's a big difference in slide weight. The 21 has typically the same factory weight as the 20 and 40, but the 41 has the same slide profile as the 17, 31 and 22 (minus the length difference). A heavier spring would most likely be needed. What spring weight did you go with for the conversion? I'd need to recheck as I think my gen4's use the same spring weight in both 20 and 21? I'd probably go up 2-4 #'s in spring weight over the 21 especially if the barrel is fluted. Not sure what barrel weight alone is between a carbon steel and stainless is as a heavier barrel will stay locked longer using the same weighted spring (this also depends on who manufactured the barrel).
 
The spring you have in the 21 for the 10 conversion is a reason the gun didn't go kaboom. Still probably not a good idea to shoot 40 in a 10. Also, not a good idea to shoot 357sig in a 40s&w also. I did this purely by accident and did bounce down the barrel to hit the target at 50 yards.
 
There's more weight in a polymer-pistol (Glocks) slide than there is in a all-metal 10mm 1911 so that tames down the 10mm more than in a 10mm 1911. It's all about physics.

Plus, the slide on a G20 is a little heavier than the G21 slide , an with the 10mm that is more powerful than a .45 acp bumping up to a 20 lb. recoils spring (G21 = 17 lb.) would be best.

Also, conversion barrels between the G21 and G20 have differences in the chamber hood width. The 10mm barrel hoods are about 0.427" wide at the back. The .45 ACP is about 0.480", so a 10mm conversion barrel has the same width as the .45, and visa versa if going from 10mm to .45.

A G20 factory barrel in a G21 slide looks like this.
1713370752268.png

A G21 10mm conversion barrel looks the same as this .45 acp factory barrel in a G21.
1713370906529.png


Also, if you want to shoot .40 S&W get another conversion barrel that fits the hood width of either the G20 or G21.

Also, G40 barrels will fit in a G20 but stick out, and the same applies to the G41/G21.

BARREL............FITS PISTOL(s)
G17 preGen5.....G17 preGen5
G17 Gen5...........G17 Gen5 + G19, G26, G45, G47
G17L..................G17L + G17 preGen5, G34 preGen5
G18....................G18
G19....................G19 + G26, G45
G20....................G20
G21....................G21
G22....................G22 + G31
G23....................G23 + G27, G32, G33
G24....................G24 + G22, G31, G35
G25....................G25 + G28
G26....................G26
G27....................G27 + G33
G28....................G28
G29....................G29
G30....................G30
G30S..................G30S + G36
G31....................G31 + G22
G32....................G32 + G23, G27, G33
G33....................G33 + G27
G34 preGen5.....G34 preGen5 + G17 preGen5
G34 Gen5.....G34 Gen5 + G17 Gen5, G19, G26, G45, G47
G35...................G35 + G22, G31
G36...................G36 + G30S
G37...................G37
G38...................G38 + G39
G39...................G39
G40...................G40 + G20
G41....................G41
G42....................G42
G43....................G43
G45....................G45 + G19, G26
G46....................G46
G47....................G47 + G17 Gen5, G19, G26, G45
G48....................G48 + G43
 
Talyn said:
There's more weight in a polymer-pistol (Glocks) slide than there is in a all-metal 10mm 1911 so that tames down the 10mm more than in a 10mm 1911. It's all about physics.

Plus, the slide on a G20 is a little heavier than the G21 slide , an with the 10mm that is more powerful than a .45 acp bumping up to a 20 lb. recoils spring (G21 = 17 lb.) would be best.

Also, conversion barrels between the G21 and G20 have differences in the chamber hood width. The 10mm barrel hoods are about 0.427" wide at the back. The .45 ACP is about 0.480", so a 10mm conversion barrel has the same width as the .45, and visa versa if going from 10mm to .45.

A G20 factory barrel in a G21 slide looks like this.
View attachment 56061
A G21 10mm conversion barrel looks the same as this .45 acp factory barrel in a G21.
View attachment 56062

Also, if you want to shoot .40 S&W get another conversion barrel that fits the hood width of either the G20 or G21.

Also, G40 barrels will fit in a G20 but stick out, and the same applies to the G41/G21.

BARREL............FITS PISTOL(s)
G17 preGen5.....G17 preGen5
G17 Gen5...........G17 Gen5 + G19, G26, G45, G47
G17L..................G17L + G17 preGen5, G34 preGen5
G18....................G18
G19....................G19 + G26, G45
G20....................G20
G21....................G21
G22....................G22 + G31
G23....................G23 + G27, G32, G33
G24....................G24 + G22, G31, G35
G25....................G25 + G28
G26....................G26
G27....................G27 + G33
G28....................G28
G29....................G29
G30....................G30
G30S..................G30S + G36
G31....................G31 + G22
G32....................G32 + G23, G27, G33
G33....................G33 + G27
G34 preGen5.....G34 preGen5 + G17 preGen5
G34 Gen5.....G34 Gen5 + G17 Gen5, G19, G26, G45, G47
G35...................G35 + G22, G31
G36...................G36 + G30S
G37...................G37
G38...................G38 + G39
G39...................G39
G40...................G40 + G20
G41....................G41
G42....................G42
G43....................G43
G45....................G45 + G19, G26
G46....................G46
G47....................G47 + G17 Gen5, G19, G26, G45
G48....................G48 + G43
Click to expand...
Haven't tried any of those combos, but a 20 barrel (aftermarket) extended will not fit into a 40 (as far as the 1's I have don't). As far as a 20 fitting into a 40 (6.02"), the 20 (4.6") is 1.42" shorter. I'll try the extended 20's and check on fitment in the 40 and post findings.
 
Talyn said:
In reference to the chart, it's obvious that a standard-length G20 barrel could not work in a G40 slide.
Click to expand...
Barrel diameter at end of slide is .6295" which is the same on 20, 21 & 40, but 41 is smaller and just slightly larger than 22/31/17's. Hood is wider on 10's than 45's (as @Talyn ) posted. So, if the barrel is long enough you can fit 20/21/40 barrels into each's slide, but restricted by hood width.

Saul Goodman
 
SaltyMonkey said:
Glock 21 is 45ACP
Glock 20 is 10 mm Auto
So what did you buy?
A 21 in 45 then bought a 10 mm barrel?
Click to expand...
Yup. And a heavier RSA. So far no issues with the extraction. That is something I was told may happen and would require a G20 extractor.

I got the info off of Glock talk. The .40 in a 10 I got from an IPSC shooter. The aftermarket barrel is fully supported and a lot of shooters run .40 in their 10's. Just clean real well when you are done.
 
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