"The Chiappa Firearms M6 X-Caliber Folding Shotgun/Rifle with 8 Inserts delivers multi-caliber versatility in a highly compact and portable package. In its natural state, it accepts one 12-gauge 2-3/4"" shell and one .22 WMR round, making it ideal for survival situations. But it also includes 8 barrel inserts, allowing it to fire .380 ACP, 9mm, .40 S&W, .45 ACP, .357 Magnum, .410 Bore/.45 Colt, and 20-gauge rounds. This makes it just about the most versatile survival gun in the world. Plus, it folds in half just by pulling down on the extended trigger guard, so it's easy to stow in a backpack or under a vehicle seat. The skeletonized stock is filled with Chiappa's own lightweight polypropylene foam, which helps keep the weight down. M1-style adjustable rear sight and fiber-optic front sight for easy targeting. Quad-rail forend for accessories. Dual triggers. Manual safety. Foam stock provides storage for extra rounds. Accepts one 12-gauge 2-3/4"" shell and one .22 WMR round 8 barrel inserts allow it to fire a wide range of popular calibers Folds in half just by pulling down on the extended trigger guard Can be stowed in tight spaces like a backpack, cockpit, etc. Shotgun barrel is threaded for Rem Chokes, and comes with a Modified choke Tri-rail forend Dual triggers Skeletonized stock with polypropylene foam Stock features storage for extra shells M1-style adjustable rear sight/fiber-optic front Manual safety"