sentences:  The grenade launcher does not have an extractor; instead notches were cut into the base of the barrel that enable the operator to remove spent shell casings manually.The HK69A1 has a single action firing mechanism with an exposed hammer that is cocked manually with the thumb after loading a round.A manual safety secures against accidental firing; the safety is ambidextrous and provides a lever on each side of the frame, above the trigger (the lever in the "S" position – indicates the weapon is safe; "F" – ready to fire).