Great stuff
Great upper parts kit. Have ran these are 3 of my Glock builds and have been pretty great. I am a big fan of GG products. The only issue I had was that the extractor on one of my builds was to tight with my upper and didn't allow proper brass extraction. It was a GG upper and I built 2 identical ones but for whatever reason this one had a minor hiccup. But easy fix I just bought an OEM extractor and was good to go. All in all they have great quality stuff.