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Cheers mateUTG 4.2 ITA hasn't broken on me yet and is rated for real steel so I'd recommend it. There are a lot out there but it's about what you're willing to spend and the ITA is about the cheapest properly rated red dot I've found (and it gets alright reviews from actual firearms owners from the research I did before buying mine so clearly it at least doesn't break immediately).
http://www.aliexpress.com/item/UTG-4-2-ITA-Red-Green-CQB-Dot-with-QD-Mount-Riser-Adaptor-SCP-DS3840W/32330881383.html?ws_ab_test=searchweb201556_9,searchweb201644_4_505_506_503_504_301_10020_502_10001_10002_10017_10010_10005_10006_10011_10003_10021_10004_10022_10009_10008_10018_10019_9963,searchweb201560_2,searchweb1451318400_-1,searchweb1451318411_6448&btsid=a86c0e1d-2b21-4b9d-a6f7-b22ebea7268c
Obviously you don't need to have the same concerns with a short dot or scope (if you're needing this for a DMR) as anything will work really. It's the cheapo holographic 552 and 551-esque clones that tend to break quickly or at least start ghosting after a while.
Visionking make consistently excellent long-range optics and are fairly priced. I'd look at them on AliExpress or DHGate.