I never put my life on anything until I totally check it out first. How many of us are going to war with our guns anyway? The upper I just bought was totally disassembled before it was shot. Yes there were some loose screws (or looser than I would have liked) but it didn't take more than a twist or two to get everything back right. You take any large Co. that puts out that much volume & their quality will be hit or miss.