Just to add to what Ifishsum said. If you use a sling with a non free
float barrel you will have a different zero for each position sitting,
standing, and prone. IMHO if you want to improve accuracy, start
with the trigger, and go from there. If I’m not mistaking your o.r.c.
comes with a 16” heavy barrel. How tight are you expecting it to
group? What kind of ammunition are you using?
Steve