My AR varmint gun has had a Jewel 2 stage trigger for over twenty years. It is worn out and now is basically a three round burst. I have to admit that I did have fun at the range today shooting the 400 yd steel plates with 3 round burst! I'm looking for either a singe or two stage trigger that is reliable and has a light enough trigger pull for shooting small groups with a heavy barrel varmint gun. What is available these days?