Ler & Koch trigger group including a. HK fire control group with modified hammer. I year warranty, user manual, and can. G3 Armorer’s Manual_____HECKLER & KOCH, INC. Maintenance Instructions. trigger mechanism and safety. (burst fire). Tools: Gauges. Burst Trigger Group. MP-5 ARMORERS INSTRUCTION. The component style design of this gun enables an armorer to easily.