POTD: Lima Company M16A4 Service Rifle

Photo Of The Day and we have a really worn M16A4 service rifle above. It’s been laid out on the table during rifle issue for Lima Company, 3rd Recruit Training Battalion, at Marine Corps Recruit Depot, San Diego, in July 2022. Here the recruits are issued their M16A4 service rifle, the one that will be their responsibility for the rest of recruit training.
U.S. Marine Corps recruits with Lima Company, 3rd Recruit Training Battalion, attach slings to their rifles during M16A4 service rifle issue.
We all know what these are for, don’t we? Of all the things on an AR-15, I think the chamber is the hardest to clean. Some parts of the bolt and the internals of the bolt carrier come afterwards. Do you agree?
Have you been part of this kind of exercise? How do you remember it? I remember having to turn in the bolt every night, and the countless hours of cleaning where the rifles were probably more worn down than from shooting.
Photos and captions: U.S. Marine Corps, Lance Cpl. Jacob Hutchinson, Marine Corps Recruit Depot, San Diego.

Ex-Arctic Ranger. Competitive practical shooter and hunter with a European focus. Always ready to increase my collection of modern semi-automatics, optics, thermals and suppressors. TCCC Certified. Occasionaly seen in a 6x6 Bug Out Vehicle, always with a big smile.
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Scraping the bolt tail and the 3 bores of the carrier with anything that is metal is not only unnecessary, but detrimental to the function of the rifle..
I remember 3rd Battalion Lima Company Platoon 3098 at MCRD San Diego in 1984, cleaning our M16A1’s. The parkerized finish was so worn, they looked like stainless steel.