OK folks I need a bit of help here. I'm fairly ceartian the stock on this fine arm is not factory. Maybe it is? Tis why I'm asking. It was gifted to me by my father for Christmas so its originality matters not. I wouldn't trade it for a million bucks. (Maybe two million) I would like to know however. The more important inquiry is what kind of attatchments are these suited for with the equipment that is installed on this particular stock. As you can see the barrel is free floated and adjustable for barrel contact. Are these threaded apparatuses just for sling swivels/pods maybe? Any info will help. Its quite hard to find good pics of original stocks. This is a 52-D by the way. Serial is 1152XXD. There is quite a bit of conflicting information on factory equipment. It does sound a bit like a "Model D" stock but I just can't find anything to compare it to. Again factory originality is of little concern although I am curious. Main reason is to see what's available for shooting attachments if any with this free float style stock. Thank you gentlemen. Pics coming directly.