You get what you pay for - AT3 Tactical AR-15 Pro Series Flip-Up Backup Mounted Iron Sights w/ Front/Rear Set

These sights look nice and are accurate but don’t stand up to any kind of abuse. After my second time taking these out the front and rear both broke in half after mounting my rifle onto a barricade. While I was being rough, none of my other backups have had a problem since. If you plan to use these seriously you might want to consider a more expensive option, but if you have another primary sight or optic you might be able to get away with these if you treat your rifle delicately.