Oversized, extended release button for quick mag changes with little change in grip. Round button can be removed for carry, reinstalled for competition. Allen wrench included. Checkered face with 40 LPI for a positive grip and quick mag changes.SPECS: Release – steel, blue or stainless steel (SS), Both include oversize, stainless steel removable button. Mag catch only, no lock or spring. SPECS: Release – steel, blue or stainless steel (SS), Both include oversize, stainless steel removable button. Mag catch only, no lock or spring.