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  • Double Diamond Standard Replacement Barrel for Glock Gen1-4

Double Diamond Standard Replacement Barrel for Glock Gen1-4

$99.99 to $209.99
SKU: 1000
$99.99 to $209.99

The standard groove and land rifling make this an excellent choice for those who wish to shoot lead, plated or jacketed bullets. Can be used in factory ported or stock pistols.

Twist rate for the Rifling in all Double Diamond barrels:

9mm - 1/10" Right Hand

10mm/.40 - 1/16" Right Hand

.45 ACP - 1/16" Left Hand

Special features include:
• Ready to use, pre-fit, drop-in
• No gunsmithing required.
• Precision machined from heat treated 416R stainless forgings
• Oversized lock-up area produces greater shot-to-shot accuracy
• Tighter than factory spec dimensions
• Match grade broach cut rifling and target crown
• Maximum chamber support
• Improved feed ramp design
• Diamond turned exterior
• Okay to use lead, plated or jacketed bullets
• Fits Glock Gen 1-4 (does not fit Gen5)

Factory warranty will replace any barrels or barrel accessories which are found to have manufacturing or material defects. Customer modifications or the use of reloaded ammunition will void this warranty.

Please note: In-stock availability of our GSPC barrels may be limited. If your order is time sensitive, we recommend contacting us to verify quantities.

Does NOT fit Gen 5 models....
Click Here for Gen 5 options

The "30" option will NOT fit the G30S.

Not available for export outside the United States.

Barrels may only be returned if they are unused and in resellable condition. If the item is defective, ie, does not function, we will accept a return within the 30-day period only.

Order Online or Call Toll-Free: 1-800-601-8273

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Ratings & Reviews

14 reviews

3 stars
0 reviews
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1 star
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Double Diamond 9mm barrel for G27 worked flawlessly for me!


Just converted my Glock 27 to a 9mm with a Double Diamond barrel. I was very surprised how much tighter my groups were with the new barrel. I used Sig Elite V Crown 124 grain hollow point, Winchester PDX 9mm plus P, and Sig VCrown full metal jacket and Mag tech 124 grain hardball. About 200 rounds of flawless accuracy. I think I found the right barrel from the start. I shot from 7 to 15 yards.

Simple and great replacement barrel


I got a black G17 replacement barrel. The accuracy improved 100% and it was a simple drop-in replacement. Cannot say enough about this product. EXCELLENT!!!

Good Group, marginal finish on chamber


I purchased 2 9 mm DD barrels in black recently (couple months ago) and I will give 4 stars but not 5. I installed one barrel in a factory slide and within the first 10 rounds I have obvious wear points on the outside of the chamber, along the edges, shiny spots where the black was scrapped off. Feels like the square corners are sharper than factory barrels. The groups are tight but not impressed with the finish work. Never had this on the 3 factory barrels I have.

You will not be disappointed and the stainless makes your Glock look Great


I bought a threaded barrel first and absolutely love it, but with the threaded barrel it would not fit in my favorite holster, so I bought one of these also as mentioned before the tolerance are tight so the best way to drop your barrel in put spring in then turn the gun upside down magazine well pointed to the ceiling then put slide on. When I review the threaded barrel I had only fired about 25 rounds thru it. I have now put hundred of rounds thru both barrels not a single malfunction you can spend hundreds more on custom barrels but you don’t need to. These are simple fantastic barrels and for those of you that reload these unlike Glock barrels are fully supported so much less resizing Glock fired ammo, honestly I simply didn’t bother to reload Glock fired ammo before I got these barrels. I primarily shoot 45 but I am getting one for all my glocks, Just waiting on the sales. Lenny please hurry on the sales for these barrels I got 4 more to buy!!

Love it


Dropped right in. Works great and looks great.

Easy upgrade !


Installed this in my Glock 17. Very snug fit, takes out all the loose noise when racking. Looks great in stainless, makes the Glock look better quality wise. I was worried as you read reviews of how aftermarket barrels have tighter tolerances, and will jam with cheap ammo. Ammo is hard to get right now, and I shoot apx 90 rounds of target reloads a week. I have had no function issues with the first 100 rounds so far. This barrel will not turn you into Clint Eastwood unfortunately , but I can see my groups are a bit smaller at 7 yards. I'm so happy with this barrel, I have one on back order already for my Glock 43X. You won't be disappointed on looks alone, besides it might shrink your grouping just a bit.

Very good barrel


I just tested this barrel the past two days and have now made it my standard barrel. I am getting groups at 25 yards with my carry ammo from 1.73" to 2.35". My stock barrel was typically around a 3" group. I tested three different loads and all had improved accuracy. I also saw velocity increased by 3.5% to 5.5%.

Glock Store Perfection


Product description says 'standard', well it is far above a standard replacement item! The stainless finish and tooling are flawless. Perfect fit, smooth cycling, and feeding of the next round. The barrel seems to be a bit heavier than factory and gives more forward dead weight reducing muzzle flip a bit. A true Glock Store Performance product! My Glock 27 is finally complete! I will be replacing the factory barrels in all my other Glocks real soon with this barrel.

Great product


You won't be disappointed with this barrel choice. A true drop in fit. Went with the stainless option to convert my G23 to 357 Sig. Shipping was fast and the barrel arrived as advertised. Looks great and performs as good as it looks.