AR-15 5.56 NATO 20" stainless steel barrel bull fluted 1-8 twist

AR-15 5.56 NATO 20" stainless steel barrel bull fluted 1-8 twist. Chambered in 5.56 nato (also accepts .223 rounds).

• Made from 416 stainless steel hardened to 26-32 rc and stress relieved.
• 1-8 rh twist. 6 groove button rifled.
• .936" diameter under gas block.
• Target crowned
• Comes with barrel extension and extension pin installed. This barrel also has the gas port hole pre-drilled. Barrel extension has the m4 feedramps.