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upgraded recoil rod and recoil spring
upgraded nozzle
upgraded steel sights
tightbore inner barrel
if you go with upgraded release valves it may get you more FPS, but it's an expensive upgrade if you have lots of mags.
if you are planning to rock a silencer or threaded barrel, you should consider increasing the barrel length, that will get you the biggest increase for FPS.
most GBB pistols will be around the 300FPS mark. Even stock, the G18c should be close to that.
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