Are MI rails gtg? They are pretty cheap compared to other brands (troy, vtac, dd). I'm not ML or LE, but I only want to cry once, and don't want something that'll wiggle. I plan on mounting a red dot on it.

Specifically, I have an A2 rifle, and I don't want to replace the front sight. Is 12" the right size?

http://www.primaryarms.com/product.s...&categoryId=36 This is what I'm looking at right now.