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One of the best you can get are Magpul mbus sights, little pricey though. I've had pretty good luck with ones bought on Amazon called tacticon armament flip up iron sights for around $40. Hope this helps.

Here's a front sight item number MAG247BLK, and the rear Sights item number MAG248BLK. They are Magpul mbus sights and can get both for about 70 Bucks. Just type the item number into buds search and it'll pop up.