Built from high-quality stainless steel precision polished and treated with premium coatings these barrels rival custom work and deliver the best in accuracy and performance round after round. Threaded barrels and protectors use 1/2"-28 threads for compatibility with after-market accessories like suppressors and compensators. Features match-grade precision drop-in barrel 6 groove rifling low-temperature vaccum PVD coating creates a durable barrier against wear and tear even in the harshest environments BORSLICK Boron Nitride DCD (Dynamic Compound Deposition) inner bore treatment resists heat and carbon buildup and a target crowned muzzle. No gunsmith required.