JACK™ HPA Conversion Kit - Blemished Poppet Valves The original HK417/G28 stocks use

The original HK417/G28 stocks use a larger diameter buffer tube and therefore cannot be used on the CO2 inserts

the system incorporates a very intelligent design and is unlike anything else on the market

Bet you can’t guess what this Thing is for

and trigger/selector system can still be housed in a modified shell

ROF: 30rps The maximum cyclic rate of the F2™ is affected by several factors such as the operating pressure as well as quality of the magazine and BB's used

JACK™ HPA Conversion Kit - Blemished Poppet Valves The original HK417/G28 stocks useWe have a limited number of blemished JACK V2s available at a substantial discount. During each production run there are always some parts which do not pass QC inspections. In some cases these parts are dimensionally out of tolerance and unusable so they are scrapped for recycling. In other cases the parts are completely functional but have minor defects in "Class A" surfaces. These blemished systems are factory new but built with one or more parts