8mm BALL BEARING GEARBOX FULL SET (AK SERIES)

Complete upgrade gearbox set ver. III for AK series weapons. Set contains a fully functional complete gearbox with an 8mm bearings and instaled spring SP90, a set of steel wheels, metal spring guide with bearing, improved cylinder, metal backpressure piston head, a metal cylinder head with double sealing, plastic nozzle with seal and all other Gearbox parts.