M.A.S.S. Gen.2

Developed and manufactured by Mancraft, this buttstock chassis is a clever and comfortable replacement for standard M4 buffer tube stocks designed to provide a power source to HPA engines.
The chassis is CNC machined from high-quality aluminum alloy and anodized to minimize scratches and external physical damage. It is installed in place of a standard M4 buffer tube in the AR15 series of rifles and upgraded G36 and AK patterns. The M.A.S.S. Gen.2 is factory-fitted with a Micro HRR regulator and accommodates standard 13ci (0.211) pressure tanks. The output pressure is measured between 40 and 250psi and is adjustable by a 2mm Allen key at the bottom of the chassis. The product is compatible with the PDiK gen 1/2/3 engines and other HPA systems available on the market.
Thanks to meticulous quality and first-rate materials used in the production process, M.A.S.S. Gen.2 guarantees high durability and reliability of the internal mechanisms. This quality translates to high repeatability and outstanding performance of converted replicas.