Sons Of Liberty Gun Works 16PRECISIONSPR6MAX Precision SPR 6mm MAX 16″ Threaded SPR Profile, Black Oxide Stainless Steel, Fits AR-15

Optimized for accuracy, the SPR contour and 5/824 threads at the muzzle are by no means lightweight, but are built with accuracy in mind. The PRECISION series are 416R stainless steel, black oxide coated barrels.