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OK. I just removed the grub. The collar started sliding out almost on it’s own. So, maybe yours is stuck a bit. Perhaps some grease and a little wiggle?
Something is up with mine though. I removed the grub screw and it chunks against, what I assume is the gauge.
Guess I'll just lave it for now and address it if I ever get a leak in that area.
Now I have a question on how I fix a leak in my Mutant and where to look for a faulty seal.
When I try to put air in my rifle it immediately leaks out to 0-psi from the allen screw in the bottom by the trigger assembly (item#87 in the exploded view).
Now you will need input from other folks. My knowledge is limited. Perhaps a new thread asking for specific help on that. There’s a few guys here that know how to rebuild them. Even Ernest will chime in from time to time.