Prototype division is a new production line of SRU brand.
SRU apply 3D-weaving technology on manufacturing. This way leads concepts boom out with no limitation, also makes it much more faster to push theses amazing ideas from SRU design house into the market.

SRU Advanced Stock Grip Kit for GHK/WE M4 GBB (Black)
3D Printing Technology Bullpup kit
Include SR-Q Forgrip, SR-Q Stock With Pistol Grip
Innovation Shape & Detail Marking
M1913 20mm Rail on Rear Stock
With QD Sling Mount On Both
Designed for GHK/WE M4 Series Gas Blow Back GBB Rifle

*Package Not Include Rifle