null Skip to main content

5.56 NATO, 16" Black Nitride M4 Barrel, 1:7 Twist, Mid Length Gas System|Barrel


This BCA AR-15 16" M4 contour black nitride barrel has a mid-length gas system with a 1:7 twist rate. It is chambered in 5.56 NATO.

All Finished Barrels go through a 100% Inspection Process. Inspections Equipment includes CMMs and Air Gauges for the Bores.

WARNING: This product can expose you to chemicals, such as lead and other petroleum products, which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.  For more information go to

It is the responsibility of the consumer to ensure all state, local, federal, and ITAR regulations are followed                  

Does not include gas block or gas tube

More Information
SKU 1290-B556MM41617(M)
Weight 1.9000
Length 16
Profile M4 Contour
Twist 1:7
Finish Black Nitride
Material 4150 Chrome Moly Vanadium
Thread Pitch 1/2 x 28
Caliber 5.56 NATO
Feed Ramp M4
Flutes N/A
Gas System Mid Length
Gas Block System 0.750
Gas Hole Diameter 0.072
Classification Barrels
Magazine Capacity N/A
Platform AR-15