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Here is some renderings, of the hop area mods done.
If ya can't get the nozzle seal part perfectly even (when sighting down the barrel), install it so that any protruding part is at the top of the barrel. This way, any hooking left will be beneficial, in the form of hop-up. strive to have no protrution though.
To trim the hop-up rubber nub, flip it inside out, and cut off with razor.
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