Years ago I ordered a 6920 from Ken, I had him do the reliability package. I did it, because the arfcom crowd hated Ken, and I thought that was great...
I thought Ken was good to talk to and deal with and knowledgeable, higher prices, but there was no doubt about the authenticity of the parts you wanted.
What the reliability package consists of is or was a secret of sorts.
I did have some issues with my 6920...it bled a lot of gas out the gas block, as it turned the sling and my glove black. It gave me fits with failures to extract..mostly with Win3131, which at the time was notoriously bad ammo...I spoke to Ken, and he said to try Remington UMC, as that is what he test fires the guns with. It ran...so I took it to a Pat Rogers class, where I had some issues.
Emailed Ken again, and told him I was not confident in the gun, and he agreed to have me send it back, and evaluate/fix it. IIRC, he replaced the barrel, and I had no more issues...but like the rest of my guns, they go thru multiple changes, and eventually what ever the package consisted of was replaced/deleted when I put on a new barrel and handguards.
Would I do it again? Probably not, but I would not hesitate to send a Colt AR to him to be fixed. I purchased the parts for a "Ken Elmore trigger job" from him, and they continue to serve w/o issue. I've run 20-30 mags with his red spring installed w/o issue...both thru countless carbine classes. I still have an un opened case of his "cage code" mags with red springs installed.
HTH