AR-15 5.56 16" stainless steel hbar barrel straight fluted

AR-15 5.56 16" stainless steel hbar barrel straight fluted features:

• Made from 416 stainless steel hardened to 26-32 rc and stress relieved. 1-9 rh twist.
• 5.56/.223 chamber
• Carbine gas system
• 1/2-28 thread for attaching a muzzle device
• .750"diameter under gas block
• Polished stainless steel extrerior
• Comes with barrel extension and extension pin installed. This barrel also has the gas port hole pre-drilled.
• Barrel extension has the m4 feedramps.