POLARSTAR M249 Hollow Grip Bolt and Nut

This bolt and nut comes standard with the POLARSTAR 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.