Please READ - The chamber used in these barrels will shoot 223 or 5.56 ammo.  Best accuracy will be acheived by handloading.  Melonite treated 4150 will easily last twice as long as stainless barrels. 3R rifling is a higher performance version of 5R rifling.

• Chamber: 223 Wylde
• Profile:  midweight-.850/.750/.718
• Fluted: No
• Barrel Length: 20"
• Twist Rate: 1:7.7- Hybrid 3R rifling
• Gas System: rifle Length
• Diameter at Gas Port: .750" 1.9" long boss
• Muzzle Thread Pitch: 1/2-28
• Material: 4150 Chrome Moly Vanadium Steel
• Finish: Melonite
• Process: Button Rifled
• Barrel Lining: Melonite
• Barrel Extension: M4
• Assembly: Stripped
• Weight: 2lb 14oz