well when i put my hopper into my feed its loose and when i was playing the other day it had to of fallen off about 3 times.. is there any way to adjust it on an impulse?
you can also drill and tap 2 holes in the feedneck and place some set-screws in them to clamp the hopper in place. if you cant do it yourself you might as well buy a CCM neck. they are the best out.