Umbrella Prometheus 6.03 EG inner barrel w/ R-Hop and Prowin M4 Hopup – Umbrella Armory
Prometheus ELITE CNC Aluminum Hop-Up Chamber for Airsoft AEG Rifles (Model: M4/M16)
CNC Hop-Up Chamber for M4/M16 Replicas ProWin- shop Gunfire
ProWin Hop Up Chamber for Tokyo Marui M4 Airsoft AEG
ProWin M4 / M16 Hop Up Chamber ( Blue )
ProWin Hop Up Chamber for Tokyo Marui M4 Airsoft AEG
ProWin AK Hop Up Chamber for Marui AK - eHobbyAsia
Prowin M4 Hop-up Chamber - TDC Bracket Converter Kit (R-HOP/FLAT-HOP/ – Airtech Studios
ProWin M4 / M16 Hop Up Chamber ( Blue )
ProWin] M4 Hop Up Chamber[For Tokyo Marui M4 AEG] – Asiaairsoft
ProWin Hop Up Chamber for Tokyo Marui G&P Airsoft AEG