Kodiak; the slickest lube, according to what I have read, and will try soon, is the Thin Film Protection products. Smooth Kote is a thin liquid that you use to cover the clean degreased parts. You then sprinkle some powder, BP-2000, which is claimed to reduce friction another 20%. You only need to do this at rare intervals; they claim a Glock fired 40,000 rounds and still had a good coating. You can tell if the parts are coated by simply brushing them with a toothbrush. The dirt should come right out.
Yes, you say, but isn't PTFE the slickest stuff around. Answer is yep, it is, but the problem is getting it to stick to the surfaces. This is why Slick 50 didn't work; the PTFE just slipped right off the parts, it didn't bind with the metal for 50,000 miles as claimed.
ANY good lube will work; I would use a grease such as Shooter's Choice on very high stress areas such as slide rails, and disconnector hollow in slide (of 1911). The problem with conventional lubes is that they attract dirt. Dry, thin film lubes don't.
Check out the Sentry Armorer's kit. It is enough to lube and protect 30 guns, and costs $30 from Discount Knives, whose URL is:
http://www.discountknives.com/index.html
I am NEVER without a Sentry Tuf Cloth. It is a thin cloth you just wipe on to a firearm or knife, and it dries in 20-30 seconds to a thin, non tacky, nearly invisible film. It really works; one comes in the Armorer's kit, more are available from Discount Knives for about $6. Keep that bluing in fine shape, and those critical hammer/sear/trigger contact surfaces well lubricated. Hope this helps, Walt