Description We are happy to introduce our Dirty Bird Barrels for Glocks! Proudly made and machined in the USA from 416R Stainless Steel, these barrels are the perfect upgrade for your next Glock build. Drop in fit for Gen 1-4 Glock Handguns Machined from 416 stainless steel and heat treated to RC 41 Fully supported SAAMI spec chamber and improved feed ramp design Target crown and oversized lock up area Assorted specialty coatings and finishes to choose from. These barrels only work in a slide that has a top window and doesn’t cover any of the holes. If you use this barrel in a slide and all or some of the holes are covered, it could cause damaged to your slide. The ports start 11/16″ from the muzzle on ported barrel. Backed by the Dirty Bird Industries Lifetime Warranty Made in the USA *  Please note that the actual color of the “Radioactive” option will vary. Additional information Weight N/A Dimensions N/A Color Black, Chameleon PVD, Gold, Stainless Cartridge Compatibility 9mm Twist Rate 01:10 Muzzle Thread Pattern N/A MPN D203-1, D203-2, D203-3, D203-4 UPC 810084373996, 810084374009, 810084374016, 810084374023