This is a follow-up to my previous video on building an AR 15 strip lower cheap (about 500.00), here is the link: • Video I used magpul flip up sights, however there are a bunch of flip up style sights you can chose from. I picked mine up on Amazon for about $80 bucks, here is the link: https://amzn.to/3K8cql0 Truglo red dot sight: https://amzn.to/3T9d1au I hope the video helps you in your build, if it does please like and subscribe, God bless!