Over the years, I tried a number of optics on paramilitary rifles.
Every "el cheapo" I've bought was a mistake.
I am now firmly convinced that if I need a RDS for a fighting rifle, I will hold off and save up my money. For a RDS it will be an Aimpoint or EOTech. For a scope it will be an A.C.O.G.
There are many less expensive optics out there, but I will save for a while and get the best.
If I should ever (God forbid_) need to use the rifle for serious social shooting, these are far cheaper than a night in the emergency room or a funeral.
The greatest enemy of the good plan is the dfream of the perfect plan.
Karl von Clausewitz.