The SRU kits are 3D printed conversion kits that allow you to put together an SMG or compact rifle with your airsoft pistol, depending on what model they have made one for. The kit is ultra-light and faithfully replicas the style of 'beam weapon' used by many 'EFSF' (Earth Federation Space Force) GM mobile suit (mecha) units. Shop Features: Rugged and lightweight 3D printed design Designed for use with WE-Tech MK16 / SCAR-L series gas blowback rifles Unique bullpup design makes the SRU PDW a low profile weapon platform Utilizes upper receiver, barrel assembly and internal parts of the base rifle Textured grip provide, Accessories & Parts, External Parts, Conversion Kits, MK16 / SCAR Series Kits TM Hi-Capa carbine conversion kit 3D printed. SRU also makes conversion kits for airsoft rifles and carbines turning them into bullpups or futuristic looking ones. The lightweight and sturdy platform for various glocks and pistols is made of aluminum with a polymer body. CAA MCK (Micro Conversion Kit) SIG SAUER P320 Pistol to Carbine Stock. This release comes shortly after Deterrence Dispsned released the FGC-9, an entirely home-built 9mm carbine.