got my 9mm barrel today instaled it no probs. shot 50 rnds winchester white, then 25 rnds hornady crit. duty +P , 50 rnds of wolf ammo all no probs. also i used my 40 mags for 24 rnds of 9mm also all ok. what do you use to hi lite letters , i tried to do pix of 9mm barrel in the 40 but you couldn't see the numbers?