RPB Industries M10 S.A.P. 9mm Open-Bolt Semi-Auto Pistol, 5.75 in Threaded Barrel, Cobray Marked, 2x 30-Round Magazines
This RPB Industries M10 S.A.P. is a 9mm open-bolt semi-automatic pistol from the 1978–1982 era, notable as a civilian SAP variant produced prior to the ATF reclassification that ended further open-bolt semiauto manufacture. It features welded sheet-steel construction, a 5.75 inch threaded barrel, and the recognizable Cobray snake-in-circle logo with factory rollmarks. The full-size M10 pattern, top-mounted knurled charging handle, and fixed iron sights define its distinctive MAC-10 lineage and collector appeal.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Overall Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Good Rifling - Intact, well-defined lands and grooves.
Specific Condition Notes: Markings are present. There is surface rust and pitting throughout from prior handling and use. The bore is clean with some pitting toward the muzzle. Refer to the pictures for details.
What’s Included
- RPB Industries M10 S.A.P. 9mm pistol
- 2x 30-round magazines
- Cobray/Ingram "Submachine Gun" operating manual (camo cover)
Left-side receiver rollmarks read "S.A.P. M10 CAL 9MM PAR" and "RPB INDUSTRIES, INC., ATLANTA, GA, U.S.A.," with the Cobray snake-in-circle logo on the upper—details that help confirm factory origin and configuration. Selector markings are SAFE/FIRE, consistent with its two-position manual safety.
The action is a simple blowback system with a telescoping bolt, operating in open-bolt semiautomatic form as denoted by the S.A.P. model. A top-mounted, knurled charging handle runs in a longitudinal slot, offering the characteristic handling of the M10/MAC-10 family.
The 5.75 inch barrel is externally threaded with coarse threads, and no muzzle device is installed. Fixed iron sights include a protected front sight housing and a simple rear aperture, providing a rugged, no-nonsense sighting setup.
The receiver is welded sheet steel with the upper and lower joined by a single large front takedown pin; the rear interfaces via interlocking tabs/endcap and does not use a rear cross-pin. The rectangular magazine well forms the pistol grip, which is fitted with a black synthetic housing. The rear endcap includes lugs for a stock interface.
This example includes two 30-round steel stick magazines appropriate for the M10/MAC-10 pattern, along with the Cobray/Ingram operating manual. Produced in the United States during 1978–1982, the SAP configuration and factory markings make this a noteworthy piece for enthusiasts of the MAC-10 lineage.