Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Enjoy free shipping during the holidays! Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC and to all U.S. Military APO/FPO/DPO addresses.

Enjoy Our Extended FREE RETURNS

We want to ensure that making a return is as easy as possible! With our Hassle-Free, Extended Holiday Returns, eligible orders placed from November 12, 2025 on will benefit from an extended return deadline (January 13, 2026 or 30 days after receipt of your order - whichever is later). We'll even cover the cost of return shipping. Learn more about our Return Policy.

Shopping Cart
Special offer available for this product. Click here to see!
Government Export Restriction Government Export Restriction
Government Restriction Government Restriction
Questions & Answers
What size gas tube do i need with this barrel

This 20" barrel uses a rifle length gas tube.

by me, Verified Owner, April 10, 2021
What is the diameter of this barrel between gas block journal and muzzle,"not threaded end". Expert Answer

The manufacturer does not provide that information. I recommend contacting Criterion Barrels in regard to your question.

by Hunter, Gear Expert, April 12, 2023
Customer Reviews
Helpful Positive Review
Barrel swap by Skippii, April 6, 2021
Bought this barrel to replace a 16in and it did not disappoint. Connecting bullet holes at 200 yards!!! Great product and a fair price, especially in today’s hard to find anything market!! I would recommend this hands down.
8/8 found this helpful
Read 1 Review

Free Express Shipping!

Free Two Day Shipping
Select Two-Day Shipping and use coupon code 2DAYAIRClick to Copy Coupon Code during checkout to get a free shipping upgrade if eligible!
In Stock
2 Models Available
Barrel Length
All
Search

Product Info for Criterion Barrels AR-15 Fluted Rifle Gas System Barrel

Fluting aids in removing weight while maintaining rigidity. Their fluted barrels feature eight flutes around the circumference of the barrel to both the front and rear of the gas block jTheirnal. Each flute is polished to remove any sharp edges while maintaining a crisp appearance.image

Specifications for Criterion Barrels AR-15 Fluted Rifle Gas System Barrel:

Manufacturer: Criterion Barrels
Color: Silver
Finish: Stainless
Fabric/Material: Steel
Caliber: .223 Wylde
Barrel Profile: Fluted
Gas System Length: Rifle Length
Gas Block Journal Size-Diameter: .750 in
Threads per Inch: 1/2x28
Barrel Twist Rate: 1-8
Flutes: Straight
Gun Make: AR Platform
Gun Model: AR-15
Additional Features: M4 Barrel Extension

Features of Criterion Barrels AR-15 Fluted Rifle Gas System Barrel

  • Polished stainless steel finish
  • .223 Wylde chamber that is designed to safely and effectively fire both .223 Remington and 5.56 NATO ammunition
  • Honed and hand-lapped rifling for bore uniformity and a pristine internal finish; aids in barrel cleaning and paramount for accuracy
  • Finely polished chambers for reliable extraction and feeding
  • Rifle gas system compatible with AR15 gas tube system
  • Gas hole tuned for proper function with and without suppressor
  • 0.750" Gas Block, dimpled for ease of installation and solid lock-up
  • 1/2x28 TPI muzzle threads compatible with a wide range of muzzle devices and suppressors
  • Precision-machined barrel extension with M4 feed ramps

Package Contents:

  • Criterion Barrels AR-15 Fluted Rifle Gas System Barrel

Criterion Barrels AR-15 Fluted Rifle Gas System Barrel Orderable Models

List of Orderable Models

  • Criterion Barrels 20in AR-15 Fluted Rifle Gas System Barrel, Stainless Steel, 1520S-FL12 , MPN: 1520S-FL12 , Code: 2RR-ATB-RFLUT-1520S-FL12
  • Criterion Barrels 18in AR-15 Fluted Rifle Gas System Barrel, Stainless Steel, 1518S-FL12 , MPN: 1518S-FL12 , UPC: 1893922 , Code: 2RR-ATB-RFLUT-1518S-FL12
Compare (0)