Thinking of upgrading from my compact acog to a ta31rco. I originaly bought the compact acog back when acogs where really hard to get because of most of them going to iraq. This will be for a A2 style m4gery. Can this optic be mounted to a A2 without any specific mounts? Is there a "peep hole" on the mount so you can still use your iron sights like on a compact acog. Also im interested in a actual picture of the reticle if anyone can manage. The illustrations just dont do it for me. Suggestions for another optic also welcomed. Been spending all kinds of money on this M4gery lately after I upgrade the optic I will have spent a small fortune lol.

Well the compact acog is great. I didnt have much choice back then but its a Amber colored dot reticle I am looking for something with more magnification and chevron or maybe donut reticle. Perhaps a TA31. Dont see many full sized acogs mounted on A2's however. Guess i just need to do more research.

I would suggest that if you know where a TA31F-RCO is located, and you may want one, snap it up.  With the Marines ordering 100,000+, there probably won't be many available for civilians for years to come.

Just bought (today) a TA31RCO-A4 from Cal's Sporting Armory (online). They still have A4's and M4's in stock. Looked through one last week at a gun show. The best ACOG yet.

Other then the reticle is there any real noticable difference between a TA31 and a RCO? I might be just better off with a TA31 I can live with a donut. Will the BDC be functional on a A2 with 16" bbl on a rco?

I believe (feel free to correct me) that the TA31 is a carry handle M193 55 gr. BDC model, whereas the TA31F has the "F" designation for "Flattop." The TA31F is for the 16 in bbl using M855, and the TA31 is for the 20 in. bbl using M193. That's really the major difference. The RCO is a 20 in. (or 16 in.) bbl flattop model for M855.