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  • Double Diamond 10mm to .40 S&W Conversion Barrels for Glock Gen1-4

Double Diamond 10mm to .40 S&W Conversion Barrels for Glock Gen1-4

$149.99 to $209.99
(3 Reviews)
SKU: 1229

SAVE MONEY ON AMMO! Reduce Recoil!
Easily convert your 10mm Glock to shoot .40 S&W in seconds!

Designed to allow shooters to change calibers by simply dropping in the Double Diamond conversion barrels in conjunction with the appropriate caliber magazine. The barrel is cut to fit in the ejection port of the intended slide.

Swapping out recoil guide rods, ejectors, extractors, or strikers is not necessary.

Please note: Will work in Gen 1, 2, 3 and 4 Glock handguns.

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

Need to switch your .40S&W to 9mm?
Click here!

Looking to convert your .45ACP to 10mm?
Click here!

Convert your 10mm to shoot .40 S&W in seconds by replacing the factory barrel with our high performance Double Diamond conversion barrel.

Double Diamond match grade replacement barrels are manufactured in the USA from the highest grade 416R stainless steel forgings. CNC machined and heat treated, providing a life time of service and better-than-factory accuracy at an affordable price.

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 "C" model (compensated) Glocks, in addition to standard Glocks.

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
• Polished feed ramp, bore and chamber
• Match grade, broach cut rifling and target crown
• Compatible with all Glock generations
• Maximum chamber support
• Improved feed ramp design
• Diamond turned exterior
• Okay to use lead, plated or jacketed bullets
• Made in the USA
• Lifetime warranty. GlockStore will replace any of its 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: Threaded barrels use 9/16 x 24 threads.

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

Not available for export outside the United States.

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

3 reviews

5 stars
2 reviews
4 stars
0 reviews
3 stars
1 review
2 stars
0 reviews
1 star
0 reviews
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G20 conversion barrel.

by

This conversion barrel is everything as stated. Works perfectly and adds a tremendous value to the G20. Very accurate. Looks nice. Fits perfect. Is a supported chamber and the fired brass will fully pass gauge before resizing. 10mm can be expensive and difficult to find brass or ammo. Alternately the 40 is pretty readily available. Price is happily affordable. Very happy with it.

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Awesome

by

This barrel in conjunction with the double diamond 3.5 connector made my G20 gen 3 super smooth! Low recoil, saving money, and extremely accurate. No issues with feeding and better lockup. The finish is durable as well. After hundreds of rounds, I can wipe the barrel off with clp and it looks brand new with no wear marks.

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Great barrel, but consider this.

by

This barrel is Phenomenal no doubt it works great. But my only concern is using the Glock 20 SF with this barrel caused many of the casings to fly back towards me more than normal as the ejection port is much wider for the 10mm and ejections imperfectly with the 40 smith and wesson as it's a shorter round. Only Recommendation is to sell some part to use to have proper ejection with 40 S&W and use safety glasses always as more casings fly back towards you with you not using the proper slides.

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