09-06-2019, 10:24 PM
I don't want to offend you or your friend, but are you sure the barrel was installed properly? I had an upper that grouped really badly like that. I had bought it from Delta Team Tactical as well. After inspecting it, the barrel nut was not tight. It actually rattled on the gas tube! After disassembling and properly reassembling the upper it worked fine and had decent groups. Just something to check.

