One or both action screws are too long.
Tighten one and check, then the other and check. Usually the offending screw is the front one (barrel end).
If it's only a little (sounds that way) you can file it off or hit it on a belt sander. If you have a lathe, then throw it in a collet.
I recommend a very slight beveled/chamfered edge for the screw to start easier or better yet, to slip a 1/4-28 nut on first so after shortening, you clean the threads as you remove it and gives you more to hang on too while shortening.
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