JHQ Tech is fond of using the HPA Tippmann M4 with the blowback recoil feature... "Probably my favorite recoil gun. once you get them tuned they're a blast and ul never want to go back. I've run this thing through the worst weather even shooting it underwater and it's never failed.

Fps range 280-500

Mods/upgrades:

• tdc+maple leaf 70 mr hop + orga 6.20 barrel
• heavy bolt
• nozzle oring mod
• replaced velocity screw with larger diameter set screw
• replaced valve orings with better quality/ slightly thicker ones for better seal
• ambi selector
• amped tippmann ptc+ amped hgl"