Customer Service | Hours: Mon-Fri 9AM-5PM EST  Phone: (704) 774-1102

NOTICE: Placing an order for item(s) that require an FFL transfer? We HIGHLY recommend contacting your FFL before placing your order. Due to recent events it could be possible they are delayed, closed or not accepting transfers.

Swipe for More

AR-15 20" Heavy Barrel, 6.5 Grendel Type 2, 1:8 5R, Black Nitride

MPN: B6.5RHB20185R(M)


Premium Grade AR-15 Heavy Barrel, 20", 1 in 8 5rd twist Black Nitrided
Gas port drilled for rifle length gas set up, and threaded for comp.
Barrel Extension in rear with feed ramps ready to install into receiver. 6.5 Grendel

Don't forget the AeroShell 33MS Mil Spec Armorer's Grease!

This is a premium grade 20" Black Nitrided AR-15 Heavy Barrel from a highly respected U.S. contractor/barrel manufacturer.
These premium barrels are renowned for their deep, crisp, and consistent rifling and extreme accuracy.
When it comes to AR-15 barrels these beauties are the granddaddy of them all.

1 in 8 5R twist, gas port drilled and set up for rifle length gas system
threaded for any standard AR-15 compensator. .750 gas block size, .070 gas port diameter

Barrel Extension in the rear with feed ramps ready to install into any standard AR receiver.

Barrel is chambered as 6.5 Grendel.

1 in 8 5R twist rate performs well with both  heavy and light grain bullets

What a deal.......

All barrels are manufactured on modern CNC equipment to completely machine the barrel. We drill, ream, rifle, turn, chamber ream, pin the Barrel Extension, drill the gas hole, and mill the flutes, all on late model CNC Equipment.  The Barrels are manufactured under the ISO 9002 Quality System, and each barrel goes through a Final Inspection before shipping.

What is 5R Rifling

Conventional rifling uses either 6 or 4 symmetrical lands and grooves on the bullet. Each of the lands (the raised portion of the rifling) are directly opposite one another. Likewise the grooves are opposite of one another. 5R rifling improves upon this by using 5 lands and grooves over the even numbers which puts lands opposite of grooves. Further, the transition from the top of the land to the groove is sloped.

5R reduces projectile deformation as it passes through the bore during the firing sequence. By placing the lands opposite of the grooves, the bullets are no longer squeezed on opposite sides ensuring the projectile stays uniform instead of squeezing material into the grooves. More uniform projectile means better accuracy. Secondly, by sloping the transition to the groove, the barrels become much easier to clean. In a conventionally rifled platform, these corners become depositories for lead and superheated materials left after shooting. Cleaning supplies have a hard time reaching these corners as they are incredibly small. By sloping it, cleaning supplies are easily able to get to the deposits.


Additional Length: 20
Profile: Heavy Barrel
Twist: 1:8 5R
Finish: Black Nitrided
Material: Chrome Moly Vanadium
Thread Pitch: 5/8 x 24
Caliber: 6.5 Grendel
Feed Ramp: M4
Flutes: N/A
Gas System: Rifle
Gas Block System: 0.750
Gas Hole Diameter: 0.093
Type 2 Bolt Carrier Group required
SKU ACC-B6.5RHB20185R-M-11
Country of Manufacture United States
License Requirement None
Manufacturer US Contractor
Mfg. Part Number B6.5RHB20185R(M)
Caliber/Gauge 6.5 Grendel
Action No
Barrel Length 20
Barrel Twist 1:8 5R
Barrel Bore Type No
Barrel Finish Nitride
Barrel Fluting None
Barrel Profile Heavy
Mount Type No
Beam Color No
Firearm Fit No
Threaded Barrel No
Condition New
Free Shipping No
Weight 3.20 Lbs

Why Customers Bought This

Questions & Answers

Customer Photos & Videos

Others Also Viewed...