This is a used Excal ACP trigger. Works with linkage bows (Suppressor, Bulldog), but not with standard Matrix or Micro unless you can find a separate trigger stem. Bought used off eBay for a project, then found a cheap Trigger Tech that made it easier. It is obviously used (loktite in Guardian mounting holes plus a few very light scratches. Seem to function fine, but I never mounted it in a rail. $75 M/O, $80 PayPal (includes fees). $200 dollar trigger new.