M4 TM CNC Aluminium Hop-up Chamber 50round magazine have a look at the

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1) Mounting options

This system ensures that you can make the hopup adjustment from the outside by turning the TDC wheel

durable color that resists wear and tear

Tokyo Marui Gas Blowback G17CUSTOM

M4 TM CNC Aluminium Hop-up Chamber 50round magazine have a look at theThis 6063 aluminium hop up chamber is made by precision CNC machines. It fits M4(T. Marui) series GBB airsoft gun, and it is specially made for professional shooter and competition needs, because: 1) High precision dimension increases shooting efficiency and reliability; 2) Smooth surface finishing improves smooth loading BB; 3) The large O ring is modified for holding the hop up chamber as a composite unit, and it also keeps the hop up chamber and