Sons of Liberty Gun Works Precision SPR Barrel Features The Sons of Liberty Gun Works Precision SPR Barrel is machined from 416R stainless steel a material favored for precision rifle barrels because of its excellent machinability and resistance to the heat generated by sustained or repeated firing. The SPR contour strikes a balance between a lightweight profile and the added rigidity needed for consistent accuracy and it is paired with a 1 in 7 twist rate that stabilizes a wide range of .223 Wylde bullet weights. Polygonal rifling smooths the bore s internal surface compared to traditional land and groove rifling which can reduce fouling and improve velocity consistency from shot to shot. Sons of Liberty Gun Works states this barrel routinely produces half MOA groups across multiple types of ammunition a level of performance built directly into the barrel s design rather than relying on hand tuning. A rifle length gas system is matched to the barrel s 18 inch length giving smoother more consistent cycling and reduced bolt carrier velocity compared to a shorter gas system on the same length barrel. The 5 8x24 threaded muzzle accepts standard .223 caliber muzzle devices compensators or suppressors without needing an adapter. A black oxide finish provides a layer of corrosion resistance while keeping the barrel s exterior low profile and non reflective in the field. Backed by Sons of Liberty Gun Works warranty the Precision SPR Barrel is a serious upgrade for any AR-15 chambered in .223 Wylde that demands match level precision. Sons Of Liberty Gun Works Precision SPR Barrel Specifications Manufacturer: Sons Of Liberty Gun Works Model: Precision SPR Barrel Type: AR Barrel Compatible Hosts: AR-15 Caliber: .223 Wylde Barrel Length: 18 Barrel Contour: SPR Barrel Finish: Black Oxide Material: 416R Stainless Steel Twist Rate: 1:7 Gas System Length: Rifle Length Thread Pattern: 5/8x24 Color: Black Weight: 3 lbs Available At: GrabAGun