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This new hop-up chamber from 4UAD in Taiwan is a great upgrade for your VFC or GHK M4 GBBR
For the 4UAD Friction Pro GBB bucking
It completely replaces the original V2 FCU board that is included with the engine
The hopup wheel height indexed was completely re-engineered
and an on-off switch for fire selector mode (on = full auto
M249 easy loader switch This new hop-up chamber from3D printed speedloader adapter for VFC M249 Magazines Allows easier reloading of the original 175rnd magazines for the VFC M249. Note that filling these magazines to 175rnds can be difficult even with the speedloader adapter.