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Ryan, Sig does not give a detailed description at all. (This kit is everything you need to change the barre length on your Second Generation MPX to a 9mm 8" barrel configuration (looks like the barrel). If your MPX shipped with magazines with tan/FDE followers this is the correct model for you. If your MPX shipped with a magazine with a black follower this will not work on your gun. ) I would ask Sig directly at 603.610.3000, option 1 - Hours: Monday-Friday: 8:30am – 6pm EST
From sig "This kit is everything you need to change the barre length on your Second Generation MPX to a 9mm 8" barrel configuration. If your MPX shipped with magazines with tan/FDE followers this is the correct model for you. If your MPX shipped with a magazine with a black follower this will not work on your gun." I would ask Sig at 603.610.3000, option 1 - Hours: Monday-Friday: 8:30am – 6pm EST
