All of the M70 models share the grenade launching ability with gas cutoff, the lengthened wooden handguard with 3 cooling slots, iron sights with flip-up illuminating elements, initially filled with phosphorus and later with tritium (Which is used on the current production M70's), to improve aiming at night; the plunger that keeps the receiver cover in place during grenade launching, and a non-chrome lined barrel. Fire selectors have R markings for automatic fire (R for "rafalna", "burst fire") and J for semi-automatic fire (J for "jedinačna", "single"). In the US market, the notched safety lever and bolt hold open magazines have been emulated by many companies as aftermarket accessories for other AKs. There also has been at least one attempt to recreate the original internal bolt stop.