Could it possibly be a Dayton Traister trigger? They were available from Brownells many years back. They were in their day a top shelf trigger and had a variety of models available. I have one on an old 03A3 that I sporterized back in the 70's. Completely adjustable and it will break like glass at 5oz if you need it that light. They made several different ones but I think they are down to just single stage replacement triggers now.
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