Complete O-Ring Set, Fusion Engine (All Models) – PolarStar

F2 HPA kit for M14

PolarStar Airsoft PR-15 V2 Gen3 Fusion Engine Electro-Pneumatic Gearbox Kit (Model: EMG Edition Blue Nozzle), Accessories & Parts, AEG Internal Parts, Gearbox, Version 2 Gearboxes - Airsoft Superstore

Complete O-ring Set for Polarstar F1 HPA Engines, Accessories & Parts, HPA, PolarStar Fusion Engine/JACK/F1 - Airsoft Superstore

PolarStar Airsoft PR-15 V2 Gen3 Fusion Engine Electro-Pneumatic Gearbox Kit (Model: EMG Edition Silver Nozzle), Accessories & Parts, AEG Internal Parts, Gearbox, Version 2 Gearboxes - Airsoft Superstore

PolarStar Complete Fusion Engine O-Ring Set (All Models) – Extreme Airsoft RI

HPA Parts & Accessories

Complete O-Ring set for Fusion Engine

PolarStar Fusion Engine Drop-In Kit Generation 3 For M4 / M16

PolarStar Airsoft Megastore

PolarStar HPA Fusion Engine V2 Gen 3 G&G SR25 Gearbox

Selector bar for Fusion Engine with ambidextrous M4 body