Not impressed - Jacob Grey Firearms Ultralight 5.56 NATO Complete Upper Assembly

This URG has given more problems and joy. Failure to feed issues from day one. RMA'ed but still having issues. The same lower receiver/mags/ammo has had zero issues on a different upper. I would love to give this company the benefit of the doubt, but seeing how I'm still having a problems after RMA I'm done with this URG. 3 range trips and all I've done is troubleshoot. This item #1 on my list of having a feeling of buyers remorse of any firearm, or firearm accessory purchase I've ever made.