I've often heard that AR-15s require more lubrication than other rifles, but can's seem to find details. I'm having a 5.56/.223 Bushmaster lower being built up for me, my first AR. Can anyone enlighten me on this? My humble apologies if this has been discussed before.
The direct impingement gas system has a propensity to dry out the bolt carrier group faster than a gas piston system. Good dry lubes overcome this to a certain degree because there is no oil to "blow out".
It should take several hundred rounds to blow out the oil and require touch up. YMMV
I've run all of mine fairly dry. I only used a light coat of Breakfree CLP on the bolt and carrier
Coat the bolt and carrier, with a decent amount of lube (Slip2000, Machine Gunners Lube, Mili-Tech 1), but you do not want it driping. As previosly stated the gas burns off the lube, but if you run it dry it will devolop FTF, FTE issues in a few hundred rounds.