I use Aim Top silicone grease on all my gbbr and pistol moving parts a small amount will do the job and it lasts on the parts for quit awhile. I recently busted out the rubbing compound, and spent the day polishing the slide rails and outer barrel of my Glock and found I needed even less lube for the slide to cycle flawlessly, same with my WE M4 closed bolt polished the bolt and brass tube and it runs smoother with very little lube.
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