Zaffiri Precision match grade barrels for Glock G19 Gen 1-4. High quality performance you demand with an easy drop-in barrel upgrade. 416R stainless steel construction, 1:10 twist. Stress relieved and heat treated to RC 40-42. Made to work with Lead, plated or jacketed ammunition. Large "ZP" Logo machined on the Port Side of the lockup. Made in the USA.