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Old February 9, 2013, 08:39 AM   #9
Senior Member
Join Date: November 2, 2007
Location: Northern Orygun
Posts: 4,923
A piston system runs cleaner and cooler. There's a good reason that LMG's aren't DI. The only advantage to DI is a slight saving in weight and recoil, IMO.
You still have the same gas coming out the barrels gas port. The heat and dirt just accumulate in a different location. You are cleaning a piston and gas block instead of the BCG.

The 5.56 piston system has the bugs worked out and is a viable option. The 7.62 piston system should be as reliable. Not sure if the extra weight is worth it.

Hanging moving parts on the barrel is counterproductive to accuracy.
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