Not exactly what i thought i was getting. - JE Machine Tech AR-15 Flip-Up 45-Degree Offset Sight Set

So, these are mostly polymer, however they lay flat and the push button isn't hard to push like some sights that I have that are all metal. I have had no issues with these at all, they mount very securely. I think if you were buying these for your primary sights they may not hold up to that but if you were buying these for primary sights you must be gangster.