Does anyone know if the lubricant that comes stock on Glock pistols would be good on an AR? Seems like it is made to be long lasting. I’m newer to ownership and have just been using break free.
No. It’s basically anti seize grease. Grease is oil with a thickener added such as metal particles (the “anti seize”), soap, chalk, etc.
Use a good quality oil such as Slip2000, WeaponShield, FP10, Mobil1,Militec, etc… Use any decent brand and uses lots of it.
I’m pretty sure it’s just copper based anti-seize.
I use a good lubricant like Militec-1 or Slip2000 EWL and don’t give it a 2nd thought.
I buy the loc tite brand from Brownells. If it’s different than what glock uses I can’t tell.
If I recall correctly, the product Glock uses is called Fel-Pro. It’s a copper based anti-seize lubricant commonly used in the automotive industry.
I have not bought a NIB Glock since 2005. My Glock-fu was week back then. I recall being told to leave the copper anti-seize on the the gun and let it “work in”. I have also heard, false, clean it before use. What’s the call on this?
My solution was to buy used Glocks and not worry about it. 
Glock does recommend leaving it for the first 500 rounds, but in the Glock armorer’s course they state that it’s also perfectly fine to remove and replace with any other lube, and warranty is not affected by removing it.
The copper suspended in grease, found on new Glocks, is an anti seize compound. Anti seize compounds are typically used to prevents seizing, galling, cold welding, rust and corrosion in fasteners that you might want to remove later. It’s also used between moving parts that might not actually move for long periods of time due to long term storage. I see equipment delivered to the military with anti seize compound applied to various connectors and between moving parts. This is done because there is no way to know how long something might be in storage before being issued to the end user. It could be issued right away or it could go into war stocks and end up in a depot for decades. Didn’t verify with Glock but my assumption is they just apply the anti seize compound as a matter of course because they have no idea where their pistols will end up. I would just remove it from a new Glock because it’s not really a lubricant meant for fast moving machine parts.