DO NOT SPRAY ANYTHING DOWN THE GAS TUBE. You are more likely to cause a problem than prevent one. If you have gas tube problems, it's time to change it (otherwise done when you change the barrel and bolt).
AR Malfunctions from from 2 primary sources.. 1) lack of lubrication and 2) magazines.
1) Lube the bolt and front of the carrier area and add lube every 4-500rds for extended days. A wet AR will keep working even when dirty.
2) Magazines: Either bad mags or failure to properly insert (execute a good reload).
Thanks, that's a relief! Maybe the AR isn't such a pain in the *** to clean after all lol