RETRO Arms - M4 Hop Up Chamber Reviews

4.1 Rating 9 Reviews

Retro Arms M4 Hop Up Chamber, produced from EN AW 2007 and EN AW 7075 aluminum. Designed to allow precise adjustment in 2mm range with step of 0.01 mm. Chamber is compatible with Retro Arms gearbox but will also work with standard gearboxes. We cannot guarantee precise fitment with other gearboxes.

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“It is nicely machined and in my case feeds much better than a prowin. I've only had the chance to use it with k120s and the new g&g mags and they feed flawlessly in my ~35 rps dsg. I would recommend buying the hop up arm pack if you are looking to flat hop or rhop.”

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Posted 9 years ago