Centurion Arms Recce Barrel 16in Blasted Stainless NSN 9305.20.9000. MK12 barrels with a slightly heavier profile. Built for reliability and accuracy. Specifications for Centurion Arms Recce Barrel: Manufacturer: Centurion Arms Color: Stainless Finish: Stainless Fabric/Material: 416R Stainless Steel Gas System Length: Mid Length Threads per Inch: 1/2x28 Barrel Twist Rate: 1-7 Barrel Material: 416R Stainless Steel Condition: New Features of Centurion Arms Recce Barrel Barrel Extension: M4 Feed Ramps Chamber: Optimized for use with MK262 (Black Hills 77gr equivalent) Twist: 1 in 7 right Hand Centurion Arms barrels serve as HBAR barrels Centurion Arms barrels require no further break in Requires gunsmith installation Package Contents: Centurion Arms Recce Barrel Centurion Arms RB-16: Recce Barrel 16in Blasted Stainless NSN 9305.20.9000