I see demilled GM lower receivers still trading hands occassionally on forums and such. I believe most, if not all, of the complete GM guns out there are tax stamp (full auto) versions, resulting in a quite expensive collectible considering their relative scarcity to begin with.

As an aside, Detroit-built or associated guns would make for an interesting niche collection. There's everything from the GM M-16s to the Bauer pocket pistols, the guns of the Detroit Police Department, the infamous KTW ammo, etc.

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SWHF #448