RPB SAP M10 .45 ACP Pre-Ban Open-Bolt Pistol, 5.75" Threaded Barrel, 1981 Production
This RPB SAP M10 is a .45 ACP, open-bolt semiautomatic pistol manufactured in 1981, placing it firmly in the pre-ban era for open-bolt semiautos. It features welded sheet-steel construction with the Cobray snake logo roll-stamped on the left rear of the upper receiver shell, a 5.75" barrel with large-diameter coarse external threads, and is designed to run on modified M3 "Grease Gun" magazines. Distinct details like the top-mounted charging knob and a MAC-pattern sighting arrangement underscore its MAC-pattern lineage.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Overall Condition: Fair - Generally clean, some residue or smudges, slight corrosion.
Bore Fouling: Mild Fouling - Light buildup of fouling or dirt.
Bore Rifling: Fair Rifling - Worn rifling, slight loss of definition.
Specific Condition Details: This firearm is in solid shape. It shows various cosmetic imperfections, scratches, blemishes, and areas of finish loss.
What's Included
- RPB SAP M10 .45 ACP pistol
- One 30-round steel M3 Grease Gun pattern magazine
- One 10-round steel M3 Grease Gun pattern magazine
Manufactured in 1981 with an 1981-coded serial prefix, this SAP M10 is a true pre-ban, open-bolt semiautomatic from RPB. Its configuration reflects the period just before the ATF’s 1982 prohibition on new open-bolt semiauto production, making this example notable to enthusiasts of early 1980s MAC-pattern arms.
The pistol uses welded sheet-steel construction with pressed ribs on the upper and a steel receiver/frame, delivering the robust MAC-10 profile. Controls include a trigger-guard safety, and the charging system is the classic top-mounted, knurled charging knob.
The 5.75" barrel carries large-diameter, coarse external threads consistent with period Sionics/MAC interfaces. Sighting is straightforward and durable, with a protected front sight assembly and a simple rear reference typical of the pattern.
Feeding is from modified M3 "Grease Gun" magazines, and this pistol comes with both a 30-round and a 10-round steel stick magazine. The wrap-around polymer grip cover completes the familiar handling characteristics.
Additional period details include the Cobray snake logo roll-stamped on the left rear of the upper receiver shell and a rear triangular backplate drilled for a stock/attachment interface. The overall feature set aligns closely with early-1980s MAC-pattern production in the United States.