Originally Posted by goretro77
Piston will gain you a cleaner Bolt Carrier Group. You'll appreciate it when it comes to cleaning and maintenance time, your trigger group will also remain much cleaner. MY opinion here but there's something to be gained by a piston setup keeping the carbon from being redirected back to your Bolt Carrier Group. Also - you can now add bit of grease to your Bolt Carrier Group that I would not advise when using direct impingement uppers.
Comparing my Colt LE6920/Colt 6601 side by side with my gas piston guns the gas piston guns are so much cleaner at cleanup time.
Why would you not advise using grease in a DI AR?
People clean their firearms? Maybe I should start.
That whole easier to clean thing has merit but the carbon still collects in your firearm, it's just in a different location.