Are you planning to mount it over the gas tube or use a side mount?
IMHO that's too big n heavy for mounting over the gas tube.
For side mounts Midwest Ind. or RS Regulate are the best options.
My preference is a TRS-25 red dot over the gas tube. If you want to co-witness you'll have to go with a railed gas tube like the Ultimak, butt here are other versions of this available.
Or replace your hand guards with something like the Hogue or CAA ones that have a rail on the upper guard. That will block your irons with an optic mounted.
Or go with a quad rail, but unless that setup includes a railed gas tube (I think Troy does) it won't co-witness.
Other options are replacing the rear site with a short pic rail, just enough space for a micro red dot. Or the TNW dogleg setup which gives you a full rail from the rear site to the back of the cover.