BCA AR-15 Barrel: 20" 4150 Black Nitride Contour Barrel, 6.5 Grendel Type II, Straight Flutes, w/ 1:8 5R Twist

Out of stock

SKU: B6.5RHB20185R(MF)

  • 20" Black Nitride 4150 Chrome Moly Vanadium Barrel
  • Heavy Barrel Profile
  • 1:8 5R Twist 
  • Straight Flutes
  • 6.5 Grendel Type II Caliber
  • Mid Length Gas System

The BCA AR-15 Barrel is a 20" contour barrel profile made of 4150 steel with a black nitride finish. It is straight fluted with a 1:8 5R twist rate and is chambered in 6.5 Grendel Type II.

5R is an improvement over conventional rifling by changing the shape and configuration of the lands and grooves. Conventional rifling consists of either 6 or 4 symmetrical lands and grooves; however, in a 5R barrel, the lands and grooves are opposite of each other and sloped.The improvement reduces projectile deformation as it passes through the bore during the firing sequence and the projectile stays uniform instead of squeezing material on opposite side grooves. Hence, the more uniform projectile, the better the accuracy.

All Finished Barrels go through a 100% Inspection Process.

Inspections Equipment includes CMMs and Air Gauges for the Bores.

BCA's expectations is that our Barrels, 16 inch or longer, will hold a 1.000" MOA at 100 yards with appropriate ammo and shooting techniques.


More Information
SKU B6.5RHB20185R(MF)
Weight 3.0900
Length 20
Profile Heavy Barrel
Twist 1:8 5R
Finish Black Nitride
Material 4150 Chrome Moly Vanadium
Thread Pitch 5/8 x 24
Caliber 6.5 Grendel Type II
Feed Ramp .300 Blackout
Flutes Straight Flutes
Gas System Rifle
Gas Block System 0.750
Gas Hole Diameter 0.099
Platform AR-15