Geonox Airsoft gives his take with ETU and MOSFET-equipped DA-B13 AEG from Delta Armory... "In this video we take a look at the Delta Armory DA-B13. This AEG (Automatic Electric Gun) has an ETU and a mosfet. The ETU protects you from gear hangers and the Mosfet gives the whole thing a better response and protects the innards. You have full auto and you can play the airsoft on a game day from 14.

The handguard is made of metal and the B13 comes with a hand stop, which is also made of metal."