Rock Island Arsenal M15 General Officer Model Prototype

Most 1911 variants trace back to a factory catalog. This one traces back to a stack of 1972 Army memoranda, the kind that argued over engraving wording, sight height, and holster fit before anyone settled on a final pattern. It is a Rock Island Arsenal M15 General Officer prototype, one of the evaluation pieces built while the General Officer's pistol program was still taking shape, and it is pictured and discussed in Edward Scott Meadows' U.S. Military Automatic Pistols 1945 to 2012.

The slide tells the story. It carries the two-line gold-filled marking reading General Officer Model RIA, the so-called third type slide that appears in Meadows' chapter on these guns. The book even notes the wording was engraved as General Officer rather than the approved General Officers, the sort of detail that separates a development piece from a production run. The right side of the frame wears the Serial No. marking that the ordnance officers specifically called out in their correspondence.

Mechanically it stays close to standard 1911A1 architecture, chambered in .45 ACP, but it follows the prototype spec discussed in the memos. You get the standard military slide with vertical serrations rather than a National Match slide, a low fixed combat sight setup, the solid recoil spring guide, and the short trigger. The blue runs deep on the flats with bright polish along the edges. The bore is bright. Checkered wood grips carry the Rock Island Arsenal medallion.

The pistol is accompanied by a copy of the Meadows reference that documents this exact configuration, with the relevant pages showing the prototype and reproducing the period correspondence. For a collector who chases the moments before a military sidearm became official, this is the artifact those discussions were about.