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994 Posts
The Inland M1A1 Carbines were assembled from given blocks of serial numbers, anything outside of that is a later mix up, after all any M1 Carbine metal will fit into the folding* stock. Rock Island rebuilt multitudes of Carbines including M1A1 and stamped the stock conspicuously (usually on left side) R I A. I do not believe they produced any stocks from scratch, that was done post war at Springfield Armory. One of my M1A1’s has RIA on the left side of the wood adjacent to the rear sight. It also has a SA pistol grip.....a real rebuild with a 5,000,000 Inland in it ( with updates).