For Glock 19 - 3rd and 4th generation models; Match-grade precision drop-in barrel; 1:10 Twist / 6 groove rifling; CNC-machined from 416R stainless steel billet results in superior corrosion resistence and durability; 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; Target crowned muzzle; Individually hand inspected for accuracy; No gunsmith required