Poor quality parts - Tacfire AR-15 Buffer Tube Kit

I purchased this parts for a build, and the buffer tube start failing right away, not holding the open position with normal recoil, and the buffer too the material is too soft, because with normal recoil, i have to replace it with only 1,500 rounds, because got alot damage with the buffer retention pin, this not supposedly happen, the only
working part on to now is the buffer spring, and i done a few builds and have stock ars, i know what I'm doing just bad quality parts.