RPB Industries SM11-A1 .380 ACP Open-Bolt Semi-Auto Pistol, Pre-1982, 5 inch Threaded Barrel, 32+1
This RPB Industries SM11-A1 is a small-frame .380 ACP member of the Ingram/MAC family built in Atlanta, Georgia. It is an open-bolt semiautomatic pistol produced prior to the 1982 ATF restriction on new open-bolt semiauto production, placing it in a notable pre-ban window. It features a fixed 5 inch barrel with coarse external threads, fixed sights with protective ears, and the Cobray snake logo with full factory markings.
Condition
Overall Condition: Fair condition, showing extensive signs of prior use and handling.
Bore Overall Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Rust and finish wear are present across the pistol, with widespread scratching on exterior surfaces. The bore is clean.
What’s Included
- RPB Industries SM11-A1 .380 ACP pistol
- 1x 32-round steel box magazine
The SM11-A1 uses an open-bolt, straight blowback, semiautomatic action with a top-mounted, knurled, reciprocating charging knob. A manual safety with SAFE/FIRE selector is provided. Sights are fixed, with a front post protected by ears and a fixed rear notch for a robust, no-adjustment setup.
Construction is stamped and welded steel with a steel receiver and a polymer pistol grip. The 5 inch barrel is fixed and carries coarse MAC/Cobray-style external muzzle threads. Chambering is .380 ACP, and the detachable box magazine system is configured for a 32+1 capacity.
Left-receiver markings read "SM11-A1, CAL 380 • RPB INDUSTRIES, INC., ATLANTA, GA U.S.A." and the receiver bears the Cobray snake logo. These factory markings, combined with the open-bolt configuration and production window, align this pistol with the RPB SAP-pattern lineage produced circa 1978–1982.
Made in the United States during 1978–1982, this example represents the small-frame .380 variant in the Ingram/MAC family from RPB Industries. Its pre-1982 open-bolt semiautomatic configuration is a defining, verifiable attribute that collectors and historians recognize.