It's not tactical gear this time for the The Gear Locker, it's an airsoft gas blowback rifle... " The PTS Mega Arms MKM-AR15 is based off of your standard M4/AR Platform and operates using Green Gas instead of NiCad or Lipo style batteries. By using gas, the shooter gets the realistic recoil sensation as they pull the skeletonized trigger for each shot in 'semi', or flip the selector switch to 'auto' and feel the butt pad on the stock against your shoulder.