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First off, buying those valves aren't the greatest idea. The first thing you can do is remove the current valve inside your magazine and dremel out the area to make the outlet larger just like the ones seen in the HFV.
Start with the upgrades like a Nine Ball 6.00mm Power Inner Barrel. Then slowly work on the blowback unit. Upgrade to a light weight bbu, that will increase gas efficiency, the BBU will also be a better seal to the nozzle thus increasing a bit of FPS.
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