CYMA Platinum CM.006R MLOK M4 Metal AEG w/ MOSFET & Tracer Hop Up (10.5" / 14.5") Length:14.5" and the hinged receiver cover

and the hinged receiver cover is also steel with an aluminum rail to ensure no shift in zero for attached optics

and comes in a black finish

just because it's lightweight doesn't mean it's weak and flimsy

Black Color Lacquer Coating

Comes with fiber iron sights

CYMA Platinum CM.006R MLOK M4 Metal AEG w/ MOSFET & Tracer Hop Up (10.5" / 14.5") Length:14.5" and the hinged receiver coverHigh quality metal alloy receiver w weather resistant matte black finish Precision CNC machined 13. 5" free float slim M LOK handguard w mounting points at 1, 3, 5, 6, 7, 9, and 11 o'clock positions TM compatible Ver. 2 metal gearbox w MOSFET Full length Picatinny top rail for optics and accessories Adjustable SOPMOD style stock Low profile Flip up front and rear sights Ambidextrous fire selector, mag release, and bolt stop Built in tracer hopup unit