what's there to upgrade to put in a flat hop?
if the hop up unit isn't disfigured or improperly cast, there's little need to change it.
How do you install a flat hop?
Like any other rubber. you put it on, install the barrel nub or you put in the flat hop nub, reassemble.
A flat hop rubber is exactly like a normal hop up rubber except it doesn't have the mound on it. hence FLAT hop.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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