M249 Hollow Grip Bolt and Nut JACK This delrin spacer allows the

This delrin spacer allows the G&G SR-25 (GR25) to be used with traditional M4 series hop-up chambers in place of the original proprietary chamber

Being a dual solenoid

28g through a 6

PolarStar Filter Fitting included

the nozzle is only piloted by the solenoid to open air flow through the poppet with none of the firing air coming from the solenoid itself

M249 Hollow Grip Bolt and Nut JACK This delrin spacer allows theThis bolt and nut comes standard with our M249 series HPA engines and replaces the original grip bolt in your A&K or Classic Army M249 Mk46. The bolt being hollow allows the air line to pass through the center of the bolt so the air line can exit the replica through the grip instead of needing to drill a hole in the gun's body.