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Inspired by the MP5K, this kit changes your BK1S/BK2S into an ultra compact CQB blaster using this kit. Battery is stored on the compartment above the receiver. Able to take buffer tube size battery.Battery compartment area: 195mm x 24mm x 21mmAvailable in black, yellow and silver. Please contact us..

An excellent EoTech replica made by Holy Warrior. EXPS2 is designed to be used with the EoTECH 3x magnifier with side buttons for ease of operation when the 3x magnifier is mounted. Interchangeable between red and green reticles...

Compatible with picatinny rail...

A short M-LOK vertical grip. Only available in grey...

Stock BK2S PDW style retractable buttstock. Screw included...

Replacement BK1S and BK2S gearbox switch set with wiring..

Replacement BK1S and BK2S main spring..

Stock BK1S barrel, for those who want to upgrade from the shorter ones...

Replacement BK1S and BK2S dart gate with breech return spring...

Replacement BK1S and BK2S T238 MOSFET..

Replacement BK1S and BK2S 480 motor..

Replacement BK1S and BK2S plunger rod and plunger tube assembly..