Large Module fits Glocks: 20, 21, 29, 30, 40, 41
MAST Mounting - MAST design allows each module to be mounted in a vise or screwed to a work bench.
Built Strong. Built to Last - Made from reinforced polymer that is super tough and impact/temperature/chemical resistant.
MAST Base Mounting - MAST base has two mounting holes & allows the base to be screwed to any flat surface.
Magazine Lock - MAST modules lock securely into the firearmís existing ambi-magazine release.