Blitzkrieg Tactical 5.56 caliber, 7.5" barrel made from 4150 steel with a QPQ finish and a pistol length gas system.
10.5" Barrel Made From 4150 QPQ Steel, With Carbine Length Gas Port and 1:7 Twist Rate
16" is twice as long as it should be........
No one needs more than 8"
10.5" may get you some complaints........