This is an extremely reliable gun with an electronic trigger unit for snappy trigger response. Has In-line mosfet so it’s lipo safe. Polymer receiver and a metal 9in key mod rail. Package includes: Gun, Manual, 1 G&G hi-cap, Hera-Arms Stubby foregrip, Matrix 180mm Mock Suppressor for -14mm threads, Sightmark Red dot(does not work) Mosfet is programmable for 3round burst. Lots of battery space.