I am looking to buy a clone EOTech either the 551 or 552. Has ANYONE ever used these on a real rifle, such as an AK47 like what i plan to use it on, even a FAL or AR-15. Anyone with any info would be MUCH appreciated, i do understand you get what you pay for and they will not be perfect but as long as they hold up and hold zero that's good enough for me...unemployment limits things you know, sure I'd LOVE to get a real one, maybe even in the future i will, but for now it's a clone at best. Thanks in advance for any info you may have.