Polarstar Jack Air Nozzle
Polarstar Jack Delrin Air Nozzle. Fits on Polarstar Jack engines - replace with your gun type. The M4 is a universal fit on all M4 airsoft guns. The MP5 fits all MP5 guns. The M249 fits both Classic Army and A&K style M249 guns. The Stoner LMG option will only fit this Knight's style Classic Army gun.