I bought one from Stocky for my Stevens 200 SA and they told me it would require longer screws.
Mine was a drop in and had no problems with the trigger guard except I had to remove about .01" of wood from around the guard for a clean fit. After pillar bedding and bedding the action it is perfect.
Stocky knows what they are doing from my experience.
Sorry your experience was not as good. But it sounds like you made the best of it.
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