New eSilverEdge geaarbox featuring advanced S.D.U. chipset to manage shot-to-shot amperage draw (gearbox only pulls 11amps at ~380 FPS) for improved consistency, performance, and instantaneous trigger response making this one of the most efficient stock gearboxes on the market Metal receiver w/ full length top rail & laser engraved trademarks CNC machined 14.5" Keymod rail system (3x additional accessory rails included) Extended charging handle latch; Ambidextrous QD one point sling swivel; Aggressive ported compensator Functioning bolt stop for easy hopup adjustment w/ "Yippie kay yay" laser engraved morale dust cover & gold coated mock bolt Flip-up front & rear sights w/ high visibility fiber optic front sight Micro switch electronic trigger with near instantaneous trigger response w/ high speed competition style custom flat trigger 6-position retractable RS-1 stock