The semi-automatic Sub-2000? is designed to be the most convenient 9mm or .40 caliber rifle available. It?s adjustable and foldable to 16.25 x 7 inches for easy storage and can accept most popular handgun magazines. Plus it can easily be disassembled for cleaning or inspection without tools. Ideal for backpacking trips and situations where space and convenience are paramount.Features: Caliber: .40 S&W Weight Unloaded: 4.25lbs Magazine Type: Glock 22 Overall Length: 30.5" Length Collapsed: 29.25? Folded: 16.25? Barrel Length: 16.25? Twist Rate: 1:16? Trigger Pull: 9.5lbs