Stripped notch - Guntec USA AR-15 Pistol Buffer Tube Kit

This buffer tube showed up in good condition and upon installing it onto my lower I put the castle nut on and then the rear plate. Once it was installed I was tightening with my HAND due to planning on staking the castle nut. Once any amount of force was applied the rear plate striped through the cut out notch on the buffer tube. Poorly made weak metal. I would recommend spending more and buying something that is truly mil spec instead of fake mil spec. You get what you pay for.