I bought this barrel lightly used with a plan of having it cut down and threaded for use in my glock 31 (converting it to a 40 caliber) It shown no signs or wear. the breech block section still has all the black coating. My plans have changed. This barrell can be used in any 40 caliber or 357 sig caliber as a conversion. It is the longest factory barrel made, 6.02 inches. Would like to recover the $75 I spent, but am open to offers. Feel free to call with questions (541) 941-0808.