HK Army Alpha Air Tank Builder Halo Hopper Upgrade then snap back to hold

then snap back to hold everything securely in place

68 Caliber / 8-gram CO2: Runs standard

thermal lens

the DSR Pro ensures effortless handling and precision

Air spring return

HK Army Alpha Air Tank Builder Halo Hopper Upgrade then snap back to holdThe HK Army Alpha Air Tank Builder lets you put together your own complete air system, one order at a time. Choose your carbon fiber bottle size and the regulator that matches your setup, and it ships to you as one matched, ready to fill system no guessing whether parts picked separately will actually work together. Every bottle in the HK Army Alpha Air line uses the same lightweight carbon fiber construction and 4500psi rating, whichever size you