First off was expecting this and can't believe it took roughly 6500 rounds. Was very uneventful. I have a 22 conversion that I had in and shoot 200 22rnds swapped back to 5.56 first round it felt wiggly so I pulled it off my shoulder and the buttstock falls to the bench. My first thought was ... about time!! So swapped a different lower and off to the races. Happy it was uneventful. It was a cheap 6/7 year old plastic 80% No reason other then it was a P.O.S. functioned well for way longer then I ever thought. Also had no signs of letting loose. So if you gots one expect it.