If you have the money do it once and do it right. Lube it real good and put a little bearing grease in the buffer tube to dampen the sproing noise that you will hear if you run it dry. I thought to myself the first time I shot on without the bearing grease. " Oh no this simply just won't do". It's a hell of a racket. I don't want you to have to experience that and make your assessment of the AR's based on that noise.