F2 Low Flow Poppet, Gold JACK UGS requires addition of Milspec

UGS requires addition of Milspec Rail (sold separately) before inserts can be used

The UGS™ for the HK417 follows the same internal design as the standard UGS™ for M4/M16 series rifles but features a wider regulator body to interface with the larger diameter of the HK417 and G28 receiver extension

**Available as "Air Rigs" or stand alone "Regulators"

000" HPA tank

This allows the Fusion Engine™ to have the widest velocity adjustment range of any of our systems

F2 Low Flow Poppet, Gold JACK UGS requires addition of MilspecThe F2 poppet valve is available in two levels, Red and Gold. The Red valve is the standard valve that comes in the F2 and provides the maximum amount of air flow through this system. This makes it well suited for builds operating at field velocity limits. The optional Gold valve expands the capabilities of the system even further by making it more flexible and adaptable when tuning for different rifle configurations. Replacing the Standard Red poppet