Paul,
I am in no way an expert in this area, so I'd start off by asking what do you intend to use the AR10 for? What kind of targets do you intend to shoot the AR10 at? What ranges will you most likely use the AR10?
I have a US made Countersniper 4-16X that I bought at a very good price for my Noveske N4 5.56 "tack drivers." However, while an excellent optic it is probably too much scope for almost all serious applications even for 7.62X51. A rule of thumb for most combat application optics regarding magnification is +1 for every 100 yards from the target, ie. 2X for 200 yards, 3X for 300 yards, 4X for 400 yards etc. Having said that, I have also shot iron sights on 20" targets at 500 yards (going 10 for 10) and 12" targets with an Aimpoint Micro T-1 & 3X magnifier at 600 yards (going 5 for 5).
As previously stated there is a science and an art for the proper application of a quality magnified optic for "sniper" or designated marksmen missions. If you decide to go that route taking a quality Precision Rifle class at reputible fighting firearms school like Gunsite, etc. is highly recommended.
S/F
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