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Doubt it - front ferrule plates (if he has one - are loose - no pull on the barrel)
At the breech there will be little effect on the barrel - just the forend, [making it stiffer].
A non free float forend that is stiffer and not wobbling to a different position with each shot I think is a good thing - more group consistency due to consistent vibration - (ala M14 tuning tricks).
A forend locked to the receiver by a scope mount rail is similar to a free float rail locked to the barrel at the receiver - just not as secure and strong as free float mounts.
Personally I would not bridge an optic over to a non-freefloated rail system. I would forget that crazy riser/low ring combo and simply go buy a decent one piece mount (LaRue, ADM, KAC etc etc). Not only will it be a better solution for your mounting requirement, it will be more aesthetically pleasing as well.
If you believe you can tune an AR the same way you do an M14, you are clearly missing the point and the bigger picture overall.
