Zaffiri Precision match grade barrels for Glock 19. High quality performance you demand with an easy drop-in barrel upgrade. Compatible for Glock 19 Compatible Gen 1-5 Twist: 1/10 Length 4.60 Threaded 1/2 x 28 muzzle Thread protector is included Quality: 416R Stainless Steel Stress relieved and heat treated to RC 41 Polished feed ramp for easy feeding Target crown and oversized lock up area. Made to work with Lead, plated or jacketed ammunition Large ZP Logo machined on the Port Side of the lockup. Made in the USA