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Criterion Barrels AR-15 Hybrid Contour 6.5 Grendel Barrel Up to $17.50 Off w/ Free Shipping — 2 models

Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Mid Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY8
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Mid Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY8
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Mid Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY8
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12
1 of 8 images
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Mid Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY8
2 of 8 images
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Mid Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY8
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12
3 of 8 images
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12
4 of 8 images
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Mid Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY8
5 of 8 images
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Mid Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY8
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12
6 of 8 images
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Mid Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY8
7 of 8 images
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Mid Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY8
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12
8 of 8 images
Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12

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Questions & Answers
What is best way to get a matched bolt with this barrel? Expert Answer

I would recommend emailing us at techsales@opticsplanet.com to help you further.

by Ryan Tarczynski, Gear Expert, October 28, 2021
Is the 18” barrel available in black nitride finish. Expert Answer

No it does not.

by Ryan Tarczynski, Gear Expert, October 28, 2021
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
Amazing barrel! Easy build, perfect fit with Aero Precision Receivers. by DJR, Verified Owner, November 18, 2020
Perfect condition fit and finish. Installed barrel into Aero Precision Receiver with Quantum free float hand guard. The rifle shoots straight. The completed rifle zeroed with 6 rounds of factory Hornady ammo at 100 yards. I then moved to the 200 r...
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Product Info for Criterion Barrels AR-15 Hybrid Contour 6.5 Grendel Barrel

The Criterion Barrels AR-15 Hybrid Contour 6.5 Grendel Barrel is just what you need if you are looking for a top of the line barrel to enhance your rifle. These Rifle Barrels by Criterion Barrels are constructed to deliver premium performance with top quality materials and finish. In fact, Criterion Barrels crafted these Rifle Barrels from 416R stainless steel for the strength you need out in the field. This Criterion Barrels AR-15 Hybrid Contour 6.5 Grendel Rifle Barrel features a 1-8 twist rate that enhances your accuracy in a variety of situations. Equip a Criterion Barrels AR-15 Hybrid Contour 6.5 Grendel Barrel w/ M-LOK Gas Block to improve the quality and performance of your firearm.image

Specifications for Criterion Barrels AR-15 Hybrid Contour 6.5 Grendel Barrel:

Manufacturer: Criterion Barrels
Color: Black
Fabric/Material: 416R Stainless Steel
Caliber: 6.5mm Grendel
Barrel Length: 18 in
Barrel Profile: Hybrid
Barrel Twist Rate: 1-8
Flutes: No
Gun Make: AR Platform
Gun Model: AR-15
Firearms Threads Per Inch: 5/8x24

Features of Criterion Barrels AR-15 Hybrid Contour 6.5 Grendel Barrel

  • Contour Hybrid, HBAR
  • Barrel Length 18", 22"
  • Gas System Length Rifle Length, Mid-Length
  • Material and Finish 416R Stainless Steel
  • Chamber 6.5 Grendel
  • Twist 1-8 RH
  • Gas Block Diameter .750
  • Muzzle Thread 5/8 x 24 .630

Package Contents:

  • Criterion Barrels AR-15 Hybrid Contour 6.5 Grendel Barrel

What firearm models does the manufacturer say Criterion Barrels AR-15 Hybrid Contour 6.5 Grendel Barrel is compatible with?

The manufacturer says that Criterion Barrels AR-15 Hybrid Contour 6.5 Grendel Barrel is compatible with AR-15

Criterion Barrels AR-15 Hybrid Contour 6.5 Grendel Barrel Orderable Models

List of Orderable Models

  • Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Mid Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY8 , MPN: 65G18S-HY8 , Code: 2RR-ATB-65GSHY-65G18S-HY8
  • Criterion Barrels AR-15 Barrel, Hybrid Contour, 6.5 Grendel, 18 inch, Rifle Length, 1-8 Twist, 5/8x24 Thread, Stainless Steel Finish, Black, 65G18S-HY12 , MPN: 65G18S-HY12 , Code: 2RR-ATB-65GSHY-65G18S-HY12
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Last updated 2026-11-04 UTC.