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03 AEG steel inner barrel was designed at the request of the entire airsoft community
2) suitable for CQB games
・ O-ring
Wide 51 degree field of view
Prowin Hop-Up Chamber for M4 SP-MAPL-111 03 AEG steel inner barrelThe ProWin M4 M16 CNC hop up chamber is a major upgrade over the stock plastic or weak cast metal hop up chamber in your AEG. Metal hop up chambers are known for providing a better air seal against the AEG gearbox and feeding much more smoothly than plastic chambers. However, many cast metal hop up chambers have weak points in the metal due to the casting process, but this issue is completely eliminated with the ProWin chamber. This hop up chamber is
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