I run an EoTech on a LaRue 13.2. I have had tons of rounds through the gun, getting it really, really, hot and haven't experienced any problems. My only concern would be that the screw on the EoTech's integral mount could work itself loose, but I've never heard or seen it myself.
No problems so far, other than the fact that I can't remove the optic without the zero being messed up (I don't have a mount for it).
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