What are your guys thoughts on these sights? I'm building another ar and this is gonna be a gun that I'm just gonna use iron sights to work on my shooting...so what are your guys opinions on these sights? I will be using the fold up sights and am looking at the HK style since it's round and my back apperture will be round as well so I can center them also do they hold their zero well?...Any advice you guys can give me on this I appreciate it!! also any other suggestions you guys have OTHER than magpul throw out there!! I would just like them to be flip up... Wanna kill these ads? We can help!