I'm sorry no one has yet responded to you (I'm new around here too lol). But what you're describing doesn't make much sense to me. I think your whole post uses incorrect terms to describe parts. ...like when you say the "action" moves up or down, or the screw protruding thru the "barrel".
I other words, you need to post some pics. Or a YouTube vid?
In own a mk2 Fv sr w the threaded bbl and I love the gun. I mean I love it, and I've been wanting to put a better stock on it for a while. Shoots cheap ammo I get from from PSA fantastically.
Mine has some plastic or nylon pillars attached to the action (that action screws go in) if I recall correctly. Haven't looked at it recently. But I can't quite imagine what you're describing. If I had to guess, I'd say one of the action screws was simply over-torqued too far into the action and getting in way of bolt, but I don't actually think that is possible w those plastic pillars. So, idk.
Maybe take a step back from the whole thing and try to get a "big picture" view of exactly what's going on w the gun and then of what the problem is.
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