I'm new here but need some help. I am an 03 collector but I have an M1A1icon I took as payment about 15 years ago that sat in my safe for quite a while. I recently decided to sell it to make room for another toy and I had a potential buyer claim it's a fake. I'm pretty sure it is a put together but I believe the stock is real. The stock has an 'OI' stamped inside the channel and the bottom of the grip. No P in a circle that I can tell. All that should point to it be real. The problem comes from no casting number on the butt of the stock. I've handled a reproduction stock and the look & feel is completely different.

Do I have a real M1A1 stock or a well marked early reproduction? Any help would be greatly appreciated.
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