It's HOW BIG? Our ground-breaking +20 for the SIG MPX pushes deep-cavity CNC machining to the limit. 50+1 total capacity Slim profile for low total weight More compact than bolting two mags end-to-end Easily removed WITHOUT TOOLS Angled floor stands the mag straight up on a table for easier loading Package includes extended spring at no extra cost Thumbscrew-and-gasket system lets you spin the locking screw on and off with your fingers, yet the gasket holds the screw in place against vibration. If you over-tighten it (accidentally, or because you like things TIGHT) you can turn the screw with a flat-bladed screwdriver or cartridge rim. Video of assembly/disassembly process: https://www.facebook.com/taylorfreelance/videos/1284396748284104/ Field tested by Northwest 3-Gunners Rick Huggins and Greg Purcell. Due to U.S. State Department restrictions, we cannot ship this part internationally. US Citizens living in restrictive states, check your local laws carefully.