All parts are made of duralmin, and are high-quality machined-metal. Battery is fitted in the rear. When attaching it to an M4A1 or M733, a little re-wiring is needed due to the placement of the battery.
This set includes: Outer barrel / Hand gurd / Front cap / Rear ring / Battery case / Battery case joint / swivel pin /gus block / muzzle. The body, mag, battery & Sight are not included.