Precision machined from 416 stainless steel, our premium quality Glock 17 9mm barrel is manufactured for a tighter fit, improved lockup and greater accuracy. Designed for a drop-in fit in Gen4 Glocks, and threaded for use with a suppressor or other device. Thread size is 1/2 x 28 tpi RH. Overall length from back of hood to end of threaded barrel: 5.035″. Twist rate: 1-16 LH. Includes a black thread protector.