spares order @ brownells

[stronghold]

i'm pretty new to the ar and like to keep a reasonable stock of spares on hand for each of my firearms. i recently purchased a 6920, have plenty of pmags and a case or 2 of ammo.

what spare parts (springs, pins, etc.) should i add to my order? are there any particular cleaning supplies, aside from the standard kit that came with the rifle, that will make cleaning/maintenance easier?

i plan to add a BCM BCG when $ allows, but for now am looking at any other spares you guys like to keep on hand.

any help is appreciated.

thanks