This is an older Wilson Combat match barrel for the Glock 21 .45acp, probably at least 12yrs old at this point. Blued finish with normal wear. Conventional style rifling rather than the Glock factory style. This is supposed to be a drop-in fit piece and I found this to be true on 3 different Glock 21's from the D, E, and F serial # ranges. Barrel has somewhere around 1200rnds fired through it and was VERY accurate compared to the factory setup when I did my part. Never had any failures to feed either. Asking $75 delivered. Please contact me with any questions. Thanks all!