Optimized grip angle and TSP texture for positive weapon control in all environments; HK "Navy-style" style pictograph selector markings (Safe/Semi/Full-Auto); Enhanced ergonomics allow easier access to fire control components; Accepts MIAD/MOE Storage Cores; High-strength polymer and corrosion-resistant steel construction; This product can serve as one 922(r) compliant component for imported MP5 clones; Drop-in installation; COMPATIBILITY: Not compatible with S-E-F/Safe-semi SSL for metal trigger housing units, "swing-down" receivers, or "K-length" receivers