IMO don't use the o-ring on the bottom.
And I did notice it was tighter than a virgin trying to get the barrel in the hop chamber. And those madbull rubbers are crap lol
And I also noticed it doesn't like to sit all the way back in the hop chamber, it's hard to get the barrel grooves to the right spot for the C-clip.
Otherwise it works okay, but you definitely need a different hop rubber, and I used the stock CA clip to hold the barrel, it's thinner than the madbull clip that comes with it.
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