I modded the Remington Pump Shot gun for Auto Fire, (Hold fire button down to fire, but no increased rate of fire), to fire out ChemGas Grenades, roughly 7M minimum range from grenade will kill people, up to max of roughly 12M from nade that can severely to lightly damage your health. 10 rounds per clip, 10 clips, 100 total Rounds, velocity bumped up quite a bit, and does a relatively good job of rebounding off of Walls and around corners before going off, as you can see ricocheting of the BTR in the 2nd video.