 Primary systems (Barrel, Air System, Feed System & Trigger) attach to the core.Additional external components add to the overall M-4 look.These include a carry handle (fixed or removable with RIS weaver rail), T-charging (cocking) handle (Gen 3 upwards), pistol grip with trigger guard, faux clip housing with working magazine release, fake magazine with hollow interior (for storage), M-4 handguard assembly with interchangeable front handguards, M-4 forward sight with bayonet lug and sling loop, and either 3-position M4 Carbine or fixed M-16A2 style stock.