Get an armalite gas tube! - Faxon Firearms .308 Winchester Heavy Fluted Rifle Barrel

Ok, so usually I really like Faxon. I have their barrels in a few builds. However, I specifically asked which version gas tube (Armalite or DPMS) is needed for the 20" barrel. Faxon said DPMS. That is WRONG! The tube is too short to hit the gas key correctly. Because of this i havent really been able to test the barrel correctly. Which sucks because this is a build for my dad who has lung cancer. Other than that everything looks good and quality made. The only other thing that i would suggest is maybe put a ridge at the 12 o'clock postion to make lining up the gas block easier. Thats not a huge deal though.