i have a trilogy pro with the two stock backs, .687 and i think the other is a .693 or something. anyway, i'm told i need to underbore more so i'll be trying my freak barrel with the .684 insert. curiously, when i screw in the freak barrel to the cocker, the freak back pushes on the smaller air lines up front a bit. there's one in particular that goes over the top of that front block thing. it doesn't fully compress it but it does push it oblong - ish. i don't know what each of those lines does so will this setup work when playing or am i going to experience any drop off? slower cocking? nothing? etc?
fwiw, i'd try it in my backyard, but i have to be really careful about this since i'm in the city. rapid firing back there is out of the question so i can't just test it out.
the freak back i have: