From the OPTICS FAQ sticky:
Just chiming in, pics to follow, I used 2 $5 barrel clamped scope mounts from dealextreme to mount an ultradot red dot on my CZH2003. The cowitness is almost perfect with the iron sights.
I plan to similarly mount a Bushnell IER on my non-res 858 (once they arrive).
dx.com/p/2-75-inch-flashlight-and-laser-universal-gun-mount-5819[/url]
They're pretty solid by the looks of things, and I can get a pretty decent grouping out to 25 yard with my CZH2003. (1" grouping with an unmagnified 4MOA red dot - at 25 yards, that's as good as it can shoot)
I'll run a torture test a little later on to see how well it holds up and how accurate the mount is at longer distances - but I can really see no reason why they wouldn't hold up. They're just a 2 pieces of aluminium with 4 screws. How can you possibly get that wrong?
I just REALLY dislike the upper handguard mounting systems on the market. They are really expensive, and when you think about it, every time you remove and re-install your handguard you ARE technically changing the zero on the scope. Also the factory handguards on mine have wobbled loose - I believe with heavy use, those systems would too, rendering them completely useless.