Bellow is a pic of my 99% complete 16" carbine and I looking for either Iron sights or optics , I'm using this for HD, Range, for SHTF GUN, or a tool for when boys start coming around for my daughter lol ( she's 8 but times flying by!) I really like the Troy flip up iron sights but a little to pricey $200+ or the Magpul MBUS gen2 but I don't think I can mount the front on the gas block ( please correct me if I'm wrong cause I would like to go that way ) the new magpul MBUS Pros are nice all metal (ok to mount on gas block)but they are$200 or are there any other brands that can mount on gas block for $100 or less for set? Or should I forget the sights and get an optic? What's a decent priced optic of quality gonna cost and what brand? Thanks in advance for all your help!