Push your mags out to the maximum overall length allowed in 3-Gun with our extensions. Legal for USPSA and 3-Gun matches alike, these extensions DO NOT come off in use, yet are easy to disassemble with the help of a large Allen key. Design derives directly from our Tanfoglio "Super Henning" basepad which has proven very popular in the United States. Works best with Mec-Gar 17- and 19-round magazines. Also fits CZ 75 sp o1 18 round factory magazine. May experience fit problems with factory CZ 16-round, and Mec-Gar 16-round "flush fit" magazines (typical of the CZ 75B) Due to U.S. State Department restrictions, we cannot ship this part internationally.