Utilizes the Western Arms gas blowback system ensuring reliable performance with a plethora of aftermarket parts and accessories
Injection molded polymer receiver provides rugged durability without the additional weight of a metal receiver
Improved gas efficiency, reliable feeding and firing in full auto
Adjustable SOPMOD type stock
Flat top receiver is ideal for mounting optics or other 20mm accessories
20mm railed MLOK compatible handguard with MLOK mounting points on the 2 O'Clock, 6 O'Clock, and 10 O'Clock positions

Length: 680mm - 760mm, Adjustable
Weight: 3300g
Inner Barrel: ~280mm
Magazine Capacity: 50rds Uses Matrix, G&P, Western Arms, King Arms, Inokatsu, and compatible magazines.
Thread Direction: 14mm Negative
Gas Type: Green Gas
Fire Modes: Semi/Full-Auto, Safety
Package Includes: Gun, Magazine
Hopup: Yes, Adjustable

Matrix M4 GBB AR-15 w/ Reinforced WA System