Just finished a CMC Trigger install on my Sig516 and OHH my GOSH is it SWEET.
Crisp clean snap no sand grit fell smooth as silk very short pull and snap. I ordered the 91503 installed in minutes drop and go.
3.5 pull and click.
I tried one about a year ago, and since then have bought and installed two more. Great trigger for the price. I also shoot geiselle, wilson, and timney, so I have some comparison trigger time.