Others will disagree,but myself feel that grease is better on bolt lugs and heavy moving parts.Bottom line,grease stays put.Some people say oil the hell out of it,well maybe a little more than normal for break-in but if you put to much it just runs off anyway and get places where you don't want it.Any moving parts can benefit from using a lubricant but you should never have to run an XCR "wet" like you do an AR to keep the carbon from building up and hardening from extensive firing.
Exactly. When you build a engine or rifle you use high temp grease on all the metel to metel surfaces it aids in break in. Then after breakin you can use a little grease and some oil. I picked up my new XCR last week. It had the fixed Vltor stock took it off and sent it back to Terra to get the folding stock. Just waiting on the folder so I can go shoot.