First time I'm assembling my own upper that didn't come with a gas block attached.
My barrel arrived today, is the gas port supposed to be drilled completely through the barrel both the top and the bottom or is the gas port normally only drilled into the top of the barrel?
Thanks
My barrel arrived today, is the gas port supposed to be drilled completely through the barrel both the top and the bottom or is the gas port normally only drilled into the top of the barrel?
Thanks



















































