Anchor Harvey upper M4 cuts with a Black River Tactical 11.5 inch barrel. Great barrel here's specifications
BRT OPTIMUM CQB Light Profile (.750 Gas Block)
Carbine Length Gas System
BRT Gas Drive
1/2-28 Suppressor Ready Muzzle Thread
6P Rifling 1/7 Twist
4150 CrMoV Steel per...
Seems like I read this somewhere else once, but in my own load testing I've noted that even though Glock appears to break ALL the "rules" when it come to firing pin tip design, I've never seen a pierced primer!
I've added some photos so illustrate my point.
The 460 Rowland operates at, and above...