just wanted to pass along a cleaning tip. after cleaning the gas block area i sprayed it with lite coat of rem oil which is a dry teflon lube. my usual method of cleaning is to spry it down with syn safe gunscrubber. well after 100 rounds it only took 2 short blasts of gunscrubber to clean it. also used the rem oil on the op rod and that came clean with just a rag and no solvent. also the same with the forearm liner.