20" Series II Match A-1 Retro (Pencil) Barrel 1 x 7 Twist ($197)
20" Series II Match AR15/M16 Retro A1 (pencil) Barrel with M4 Feed Ramped barrel extension. The precision 4150 (CMV) barrel with M4 cut extension, chambered 5.56 NATO, 1 in 7 R.H. Twist, 6 groove, turned on center, drilled gas port, head spaced, pulled-button rifling process, lapped bore, polished chambered barrel delivers pinpoint accuracy. Each barrel is concentrically cut and muzzle threaded ½ -28 R.H. twist to accept flash hiders/suppressors, stressed relieved, turned on center to prevent accuracy robbing distortion when the barrel heats up, and hardened to 26-33 Rc giving the barrel a long life. Exterior includes detailed contouring, Nitro Carburized Finish*. Our pulled-button rifling produces a superbly accurate bore diameter with uniform rate of twist. The match barrel is machined to tighter specifications producing a tighter fit for greater accuracy. PROUDLY MADE IN THE USA. Barrel is sold stripped; set it up your way without paying for extras. Ready for YOUR choice of rifle length hand guard, .625 dia. gas blocks, M16A1 hand guard and 0.625 dia, front sight (not included; sold separately).
* Nitro carburized interior and exterior finish which is also applied to the barrel extension and gas port during heat treating and creates a monolithic black finish that is superior to hard chrome. The process does not add material to the internal dimension of the bore, increasing surface hardness to between 58-65 HRC, lowering bore friction, enhancing surface lubricity, improving running wear performance, enhancing corrosion resistance and heat resistance over industrial hard chrome.
In addition, the barrel extension and gas port are also surface converted minimizing barrel extension wear, increasing corrosion resistance and limiting gas port erosion.