A flat hop is basically a hop rubber that does NOT have a bump that would normally go in the hop window of the inner barrel. It is a smooth rubber and paired usually with a hop nub that has a flat surface that pushes the hop rubber into the inner barrel.
An r hop is similar, but with an rhop you do still use the flat rubber, but you have a piece of material permanently fixed over the hop window that gets pushed into the path of the bb (basically a dumbed down piece of surgical tubing or something along those lines)
I personally swear by a bridge hop myself. Tried it out not too long ago actually and have never gone back. A bridge hop is you still use the flat rubber, but you use a different type of nub (I use modify soft grey rubbers with promy bridge nubs myself, available from airsoftparts.ca for around 35$)
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current armament: mk43, ump.45, p90, barret, m14, g33, k98, m4 tac, m4 swat, mp5 navy, vsr10, p226, m9.
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