OP your Rant is needed but this ^^ should be respected......
YouTube is your friend and I know that is Subjective but its true and with this Know your Limits and only do what you think you can do.
What one person does is not what is recommended by another and there in lies another issue (different rant for another Thread).
Some Gun Manufactures do not put out any detailed info on the maintenance of their firearms so you will either send to them or go to a "gunsmith" But they do put out Recommended maintenance sometimes and that depends on whether you read the manual or not.
I know people who claim to be gun smiths but I would not let them fix me a glass of water (but they put together a running AR Bwahahahahahaha - Same thing OP said).
And just because someone tells you how to fix one issue does not make them an expert on all issues (they just had the one issue you had).
Quality Tools for working on Firearms are not Cheap and not everyone has them.
I am not a Gunsmith and do not wish to be called one as I can only work on certain firearms and not all and I know my limits (Gunsmith in my mind should be Jack of all Guns).
Example: Glock of Smyrna is close and Free repair on all Glocks, when I buy a used Glock before I fire it I take it to Glock Of Smyrna and let them go through it and replace all worn parts and after every 2000 rounds I take it back, oh yea because its free - in this case why would I want to learn to work on a Glock but I do know the maintenance of one regardless of this and how to inspect it to make sure it is safe to fire.
Now my rant is over......Just My.02 YMMV
Disclaimer: Put out for Laughing material and should be thought of that way
Another reason I don’t share links is that some of the folks I get my info from do not want their information shared. They run a business training folks IN PERSON, and I’m a member of their “private boards”. I can’t share links to that information.
I can, however, put the information in my own words and share it. I do this at all my training classes and it’s one of the things that make my courses worth the price of admission. Giving it freely to folks that don’t care to train is a version of cutting my own throat.
You said it can be subjective from one person to the next. Since this is so, why do you care what I recommend? I don’t have a huge YouTube following or similar......get your information where you will. I give info out to my current and former students, as well as folks that come over to my shop for help. That’s how I like to do it and will continue to do so.
If you’re not paying me, I’m not beholden to give you anything.
Some of the folks that have replied here are students and/or friends of mine. To those folks, I’ll get you the information you’ve requested.
To everyone else, I already clearly stated where to get the information from; School of the American Rifle. Join their FB page, or look at their YouTube videos. I’ve learned a lot of what I know from folks like Will Larsen (RIP), Mike Mihalski (SOLGW), and Chad Albrecht (SOTAR).
For those folks that are serious, I can recommend some excellent AR Armorer’s course, with SOLGW and SOTAR being the top 2 nowadays.