BB RANGE 042 guys a good discussion on how to build the ultimate, highly durable, and high-performance Tokyo Marui MWS (M4 Gas Blowback Rifle). They share their "tried and tested" parts recipe, emphasizing a balance between realistic recoil and flawless function needed for competitive target shooting. Their key recommendations include using G&P forged receivers and trigger boxes and EHT TDC-style hop-up adjuster, but they strongly advise retaining specific stock Marui parts, like the buffer tube and bolt carrier, for their tighter tolerances which are crucial for achieving reliable cycling and stability, even when using green gas.