Also known as the Black Fallout, the RA-140 SST is a high-performing, cost-effective upgrade to replace mil-spec triggers.
Installation instructions here -
Posted by Gary Duggan on Jul 7th 2016
I had a custom rifle, but a stock trigger. I was dealing with it, but knew I wanted a good one. This one caught my eye and I knew the quality of RISE, so I took a chance and ordered it. Very easily installed and I love it. I'm sure there are better, but this is soooo much better than the one that was in there, I'll be happy until the next sale and I get another one.