I got a free SS barrel from a buddy of mine; he’s a maintenance guy for an apt. building, and often gets free stuff due to people leaving it behind after moving or being evicted. Oddly-enough, it’s a 15”. However, the rifling is good, and it’s in nice shape, but the markings on it are unknown to me. Theres a little star (kinda like BCM) and a #4 on the chamber … Any clue???