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Old February 10, 2013, 05:42 PM   #10
Senior Member
Join Date: July 30, 2010
Posts: 857
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.
Depends upon the design of the gas block and piston system. I have a Barrett REC7 and it is self cleaning. While that sounds about like a "perpetual motion" claim - I cleaned the piston and gas block after 5,000 rounds and only got a tiny bit of grey fouling on a cleaning cloth when I wiped them both with a gun cleaner.
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