In episode 11 of their "The Armory" series, DICE Airsoft go over the Magpul PTS RM4 with the ERG, which is KWA's recoil tech for AEGs... "In Today's video, I briefly go over my Magpul PTS/PTS Syndicate RM4 ERG (Electric Recoil Gun) with what Ive done to the gun, as well as demonstrate its recoil and Electric Cutoff Features."