BPS--mine is a 50 cal. I also bought it used, the letters in the square are AN, which I read somewhere means that it was made in the 1980's. It has very pretty wood in the stock and I do not use it for hunting for several reasons. I don't want to scratch it up, I don't want to mount a scope on it and I want to hunt with a stainless gun and 777 so I have a little more time between shooting and cleaning. They are very nice traditional guns tho and I enjoy shooting it about once a year and looking at it most every day.