although paintball guns dont have hop up, they are cpable of a system similar to hop up, its called an apex tip, its an adjustable rubber ramp that creates friction with the ball to give it a varying degree of backspin, as per the sights, They do work, I've got a G&P aimpoint replica on mine and it works well, there are tons of aftermarket barrels out there for paintabll but sights are only useful to about 75feet, after that paintball guns are innacurate/have dropped to much. Although a few guys have mad rail risers that have an adjustable angle to compensate for the ball drop.
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