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It was the DSA scope mount. It eas very solid. It replaces the sheet metal top cover. You don't need to take it off to remove your bolt group to clean your rifle, but if you do, you won't lose zero. The FAL design breaks open like a single shot shotgun. When I had my DSA, I kept my Aimpoint Comp M on it. It was really nice and someday I'll get built another off the parts kit I have. The last time I had an M1A I bought the milspec scope mount and a $600 milspec scope, we're talking the 80s here so what would it be today? And that pig wouldn't keep zero between magazines no matter what I did, so even though it was dependable, and had all the actual M14 parts and bolt, etc., i considered the mount and scope to be a total waste.