One trick I was using on very sunny days was to actually close the cap on the far end of the sight so that when you look into it you see a reticle over black. As long as you keep both eyes open it works very well...... if you care about that sort of thing.
The crappy quality of eotech replicas (threadstripping, weakass reticles, incorrect english trades) has mostly lead me to abandon them outside of display purposes. Seriously, how hard would it be to just stick a REALLY bright LED in there, like all the ones they stuff into the junk at best buy?
Now you know