I have started adding Green Mountain Rifle barrels to my line card. I have options to dimple barrel, install a BCM gas block on dimples or pinned and the option to add a FSB.
Green Mountain barrels are 41V50 steel, button cut, stress relieved and air gauged. 5.56mm chamber, chrome lined, Mid length gas system, M4 ramps. Mag phosphate finish. The 14.5 is 1-7 twist, 16" is 1-8 twist.
One to three day turn around on pinned gas blocks or FSB's when parts on hand. Could be delayed longer if waiting on parts.
Green Mountain 14.5" Mid Gas
Green Mountain 16" Mid Gas