Lube on all of them is original O-158.
Really maintained is thoroughly cleaned after every range trip. Usually 100 to 200 rounds, twice a week.
Ammo is PPU, Wolf Gold, Federal, Geco, Norma, IMI.
I don't do steel.
I also don't do mag dumps as I consider them a frivolous waste of ammo.
FWIW, I have well over 20,000 rounds through various ARs, my SP1 is just shy of 10,000.
I bought the Sport II just to compare it to a couple of other major firearms manufacturers ARs.
BTW, it runs great. I like it and recommend it as an excellent starter AR. The only out-of-the-box issue was the spring clip on the dust cover hinge was not installed in its groove and fell off. I put one of my spares on and all was good.
Thanks