I forgot to mention in regards to the Mark II and Hawkeye models, Dayton made a replacement trigger for a while, I have one and it is very nice. All you do is swap the parts. If you wanted to enhance the set up on that one there is adjustment available but I found the specs as is more than appealing.
I believe that you're talking about Dayton Traister. I put one in a MKII 20+ years ago and have been pretty happy with it. They're adjustable for pull, but not overtravel, but that's a fairly simple thing to remedy. Price was in to $45 range when I bought mine.
