I like FAB Defense Backup Sights RBS & FBS - polymer, very low profile, ambidextrous, Made in Israel not China. Cost about $70 for front and back --- FAB Defense Backup Sights RBS & FBS | 7.62 Precision Custom Firearm Finishes

I love this on my 300 Blackout http://www.primaryarms.com/Command-A...aa-ffs-frs.htm



PS: DO not buy P.T.S. Magpul. PTS products are designed for Airsoft.