Double Diamond 9mm Premium Conversion Barrels for Glock Gen1-4

Retired with a Gen 3 Model 32 .357 sig. service weapon. It killed on both ends, ordered the Double Diamond 9mm conversion barrel and dropped it down to a 9mm.

Gun works flawlessly and the teeth have been pulled from that old .357 sig monster not to mention the 9mm ammo is dirt cheap.

Had one worked flawlessly until the she devil ex sold it. Ordered another. This barrel is drop in perfect transforms my model 22 40 cal to a model 17 9mm without any other changes. Great accuracy. Or I wouldn't be getting an other .

Very nice conversion barrel. Works flawlessly and gives the gun a new look.

Installed SKU: 1012-STS-A27 9mm conversion barrel on my .40 S&W caliber Glock 22. Almost 500 rounds thru it without a single malfunction. Surprising the 9mm shot to the same point of aim as the .40 caliber. Average group at 7 yards is 3/4 inch.

Beautiful barrel! Dropped in perfectly! Shoots laser straight! Made my Glock 23 enjoyable to shoot again!

Ordered the Stainless Steel version for my G23 and it ran right out of the box. Direct replacement, no issues. I put oil in the factory suggested locations and ran 100 rounds immediately. No issue no hiccups. Dead on accurate. I already had the black yikes connector and the 6lb trigger return spring installed and man it is a lot of fun to shoot.

Took the old barrel out slid the new one in and bam it fires 9mm, simple as that. I had one jam after firing the 19th shot trying to eject. Maybe break in period? Haven't had an issue since shot 150 rounds out of it now.
It does get caught on the slide release when installing it- but if you hold it down slightly the barrel will clear it and the slide slides on no problem.
Accuracy hasn't changed one bit
I would 100% buy again

Double Diamond premium conversion barrel for Glock G23 gen4.
Just received the DD barrel and installed into the G 23 .40 s&w glock and purchased the glock 9mm g19 mag.
No other mods. Yook to the range and shot 50 rounds of S&B 115 1nd 124gr ammo. NO FTF or FTE or stove pipes or jambs. Worked flawlessly, very pleased with this conversion from 40 to 9mm.
So Now I have 2 glocks, shootin 9mm at range and .40 S&W for EDC.

Inspected the barrel befor install and it was finished beautifully. no nicks, scratcjes or dents and the feed ramp was super polished, so smoooth feeding. Love being able to shoot .40 and 9mm from same g23. This gen 4 G23 has been perfect fron when it was nes.

Also less muzzel rise as the slide for the .40 g23 is heaver than the g19 9mm slide .
Great satisfied customer.
Best to you guys At GS.