https://hardairmagazine.com/news/product-news/shooting-inovairtech-big-bore-air-rifles/

"Inovairtech air rifles use a Magnum Air Cartridge (hence the name MAC), that’s about the same size as a .50 cal BMG cartridge. Each cartridge is filled with high pressure air directly from a tank. A pellet is pushed into the front and then the cartridge is loaded and fired. It’s very easy to do and the cartridges can be filled and used any number of times."

• MAC 35 .357 Big Bore Air Rifle
• Bolt is snapped off
• Not sure of the function. Sold as is.
• Includes various parts and several spare cartridges.  
• Final Sale