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Revive the Thread:
Compatibility with the inner barrel was the problem I am having. The Prometheus barrel is not compatible with the MadBull Hopup unit. The barrel is either a little to big or MadBull makes the barrel section a little too small. Switching to a MadBull barrel was the only way to find out for sure. This comes right from the Gun Doc.
So if you get this hopup unit make sure you have a compatible inner barrel. Well there is no list of compatibility so that was why I didn't think I would have an issue.
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