Developed in the 1970s as an attempt to create new revenue from outside the NFA field, the SM10 used many of the same components as its full auto forefather the M10, combining an open bolt action with controls configured for semi-automatic function only and eliminating the slots for the telescoping stock to make a handgun available to the general public. Production would be nixed in the 1980s, as the BATFE determined that open bolt weapons are too easy to convert to full automatic. This example has been registered as an NFA item, with a set of selective fire components installed and the rear slots opened up, effectively converting it back to a M10 9mm submachine gun; no NFA/SOT operator's mark is present on the weapon, and the registration gives the manufacturer as RPB. Blade and peep sights, with the SM10 markings and "SAP" prefix serial number on the right side of the frame, safety switch on the underside next to the triggerguard, a selector switch on the left side (marked "SEMI", with the full auto position properly unmarked), plastic grip extension, and a two-position telescoping buttstock. The barrel is threaded, but properly without provision for a swiveling front grip. Included with the lot is a black leather "operational briefcase" style concealment device, configured to hold the weapon with the stock dismounted and the included silencer (see Item B for more details) in ready to fire condition, with a firing port on one side (with a business card slot to conceal the port), and internal casing deflector to reduce the risk of a spent shell bouncing back and jamming the weapon, and a firing lever that extends through the bottom of the case.

Excellent as upgraded to selective fire operation, with 90% plus factory quality matte black finish, showing some mild handling marks and some coverage of protective grease. The grip extension and stock how mild wear. Mechanically excellent. The operational briefcase shows mild wear and tear; the firearm and silencer are a good but extremely tight fit with the included magazine. NOTE: This weapon is a National Firearms Act (NFA), fully transferable Class 3, which is registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives, (BATFE) under the provisions of 18 U.S.C. Chapter 44 and 27 CFR part 479.

Constructed from aluminum and steel, with a combination of a ported expansion chamber and dismountable wipe module for sound moderation, with an overall length of 7 1/2 inches.

Very good, with mild wear and handling marks on the exterior. The wipes are oxidized, but show little wear. NOTE: This Silencer is a National Firearms Act (NFA), fully transferable Class 3, which is registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives, (BATFE) under the provisions of 18 U.S.C. Chapter 44 and 27 CFR part 479, National Firearms Act.