Sig Sauer MPX .177 Cal CO2 Semi-Auto Air Rifle, 8-Inch Rifled Steel Barrel, Folding Sights, Black, with box
This SIG SAUER MPX .177-caliber CO2 air rifle is factory new and unfired. It features an 8-inch rifled steel barrel, a metal receiver with a black finish, and a synthetic black stock that houses an 88 g/90 g CO2 cylinder. The rifle includes a receiver-mounted Picatinny top rail with folding iron sights, plus a short accessory rail segment on the handguard for the front sight; it is not a continuous, full-length rail, and uses SIG AIR's RPM belt-driven pellet magazine system. Part of the SIG AIR ASP line introduced in 2016, it measures 25.75 inches overall and weighs approximately 6.2 pounds.
Condition
Overall Condition: Factory new condition, unfired with no signs of handling. Original box/case is included; accessories are not specified.
Bore Condition: New - As-new bore with no signs of use beyond factory testing.
What’s Included
- Original box/case included; accessories not specified.
The MPX air rifle operates via an 88 g/90 g CO2 cylinder, with the synthetic stock designed to detach for quick access to the cylinder. This setup keeps the profile balanced and makes cylinder changes straightforward while maintaining the rifle’s compact length.
Its 8-inch rifled steel barrel and metal receiver provide a solid, realistic build. A polymer handguard with diagonal venting surrounds the barrel, and the rifle arrives with a receiver-mounted Picatinny rail and folding flip-up front and rear sights; the handguard top includes only a short accessory rail segment for the front sight and is otherwise vented polymer, so it is not a continuous, full-length rail.
Feeding is handled by the SIG AIR RPM belt-driven pellet magazine system, supporting the rifle’s semi-automatic CO2-powered action. Controls include a manual safety selector, and the trigger is set at approximately 7.0 pounds for a consistent pull.
The retail box notes velocities up to 600 fps, while SIG’s current factory specification cites up to 450 fps. Overall length is 25.75 inches and weight is about 6.2 pounds, finished in black throughout for a clean, uniform look. The rifle is identified by SIG part number AIR-MPX-177-88G-30-BLK.