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Compatible with Tokyo Marui M4 MWS GBB series.
Compatible with Tokyo Marui MTR-16 GBB series.
Compatible with receiver retrofit kits for Tokyo Marui M4 MWS GBB system.
NOT compatible with ANYOTHER AIRSOFT GBBs.
Requires DIY ability.

● Material : Aluminum Alloy, Stainless, Steel, Rubber.
● This product is designed to improve the insufficient stage of adjustment in the original MWS HOP-UP system. It is adjusted with stainless steel screws with unlimited stages for precise adjustment.
● Upgrade ballistic performance! Instead of being limited to a fixed number of adjustment stage, suitable for more range of BB weight (0.2 /0.25 /0.28 /0.3 /0.36 /0.4g BBs).
● HOP-UP seat is made of T6061 aluminum alloy material with fully CNC process, the size is accurate!
● It is easier to locate the HOP-UP rubber when installing, with the double O-ring design is more stable.
● Share the same HOP-UP rubber which with Marui VSR10 & MWS SPEC., even made by different brands on the market.