Should be fine to use but yes, when it breaks, it tend to break where the boss ring is and the rear take down pin. However, if you have a A2 style with the fixed stock, those tend to last as long as a aluminum receiver. I think a lot of people are making it out that it'll break, but it shouldn't break under normal use. The reason why the boss ring tend to break is due to just torquing the castle nut too tight along with the buffer taking a pounding. Just be sure to follow torque specs. The castle nut tend to be easily over torqued item.