![Hop-up chamber for the M4/M16 type replicas Hop-up chamber for the M4/M16 type replicas](https://air.viruisis.lt/12684-large_default/hop-up-chamber-for-the-m4m16-type-replicas.jpg)
Hop-up chamber for the M4/M16 type replicas
The hop-up chamber is made of metal. The adjustment knobs and the rest of the elements are made of plastic. Thanks to the application of the o-ring by the main adjustment knob the whole system seems more sealed.
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