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which can also be finetuned in multiple ways
GBB weight range
The increased weight gives improved sound and efficiency performance with heavier BB's
This new hop-up chamber from 4UAD in Taiwan is a great upgrade for your VFC or GHK M4 GBBR
The medium sized backspin patch gives a good grip while staying around from tilting on any edges
4UAD Friction Pro GBB Bucking CRBN which can also be finetunedThe 4UAD Friction Pro GBB Bucking is here! And it includes a FREE concave nub! This nice TM bucking is a great fit for most GBB's, GBBR's and VSR's. It's easy to install and made of a solid material that will last a long time. The square backspin patch is also made with nice edge support, and won't flay over time as seen on some other brands. Innerbarrels can have different size cuts on the barrelwindow; some are narrower than others. For the 4UAD
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