OK, I got a barrel today that was suppose to be a Winchester. I was upset when I opened the package and found that the barrel had a swaged gas cylinder and an I-cut sight spline. The barrel also has a short skirt. I have several WRA barrels and it did not look like any of the other barrels that I have. The only marks on it are the PW in a circle about 2 inches down behind the rear sight. On the bottom of the flat there is a really small 3, a punch mark and some other partially struck charachter, it's either a C or O or 0. I happen to look through Harrison's book on page 58 & 59, the barrel I have is described right there as number 15. Probably being IBM made and very late issue for Winchester and only two of them being observed. I don't know about this one. Anyone have any ideas? I will try to get some pics up tomorrow.