Re: lubricants for SA's, AR's in particular
I'm shocked that out of all of these responses, only one other person has mentioned TW-25B and other associated MilComm products. I'll have to second that recommendation. Before using this, I used RemOil on my AR. It's night-and-day, the comparison in the amount of lubricity these products provide in a semi-auto action (with TW-25B outperforming RemOil by a non-negligible margin).
TW-25B is thick enough in its original formulation to stay put where it's applied, but also comes in an oil form that can be put into a squeeze-bottle, kept in a pocket during a day-long range session, and squirted into the bolt-carrier group holes to re-apply to the bolt, gas rings, inside of carrier, etc., as an aggressive firing schedule displaces lubricant from critical bearing surfaces.
This is a moot point, as any lubricant you choose can be placed into whichever dispenser is the most convenient for you, but you can purchase TW-25B in a small resealable syringe which can also be re-filled when empty. This makes it very easy to apply to hard-to-reach areas inside of the receiver, and very quick to apply to bolt lugs, cam pin channel, carrier bearing surfaces, etc.
Two negative points I could say about TW from my own experience is that it does separate into two components, and it's expensive. At least as a psychological security blanket, I'd prefer it didn't separate into constituents and stayed homogeneous.