Just bought a Winchester model 52, circa 1932. Mint bore, looks great, but it had an ugly wooden looking pistol grip extention screwed on it. Bought it anyway. While linseed oiling the stock I took off the adapter and realized it was cast aluminum painted brown by a previous owner. On the bottom of the adapter it is deeply stamped "J Unertl". I cleaned off the paint and it is simply cast aluminum exactly moulded to the model 52 pistol grip. (see pictures a few replies below). Searching the internet turns up nothing..only Unertl scopes. Has anyone ever heard of this before? any idea the value? Looks great in "the white" on my rifle...and makes it really comfortable.