16" Chrome Moly steel barrel
chambered in 5.56 NATO with a 1:9 Twist
M4 Barrel extension.
Barrel is a Carbine-length gas,
0.750" Gas block area.
Please check the barrel closely for any irregularities. It is the builder's responsibility to check headspace before assembling.
In the unlikely event you have an issue with a barrel, STOP AND DO NOT ASSEMBLE. Contact Customer Service.