Purposely routing dirt into the chamber? How? The gas system is sealed from the chamber by the bolt, gas rings and firing pin. A tiny bit of gas manages to leak into the firing pin but its dissipated by the time it reaches the extractor cut and never makes it to the chamber.
Cleaning the chamber is neither a pain nor does it take a lot of time. One brush for the chamber/locking lugs, one for the bore. Throw in a toothbrush for the upper and all is done. Unless you are in the military, a quick spray of CLP, let it sit for 30 minutes and then a wipe down is all the clean this rifle needs.
I realize most of the posters here are "bump firing" their rifles and accuracy means nothing. Why they clean them with zealouness commonly found in the military is oxymoronic. Oh wait, they fire that cheap, corrosive polecat ammo from former and current communist countries.
Another plus for the AR (until the commies started making it too) was all ammo, foreign and domestic, was non-corrosive. If you didn't live on the coast, you could fire one day and clean in three months without any corrosion. Not so with some commie ammo.
