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AR15.COM
1/8/2010 6:53:27 PM EDT
How do you take apart the piston, it is full of rust and i would like to clean it up. Its rusting were the outside nut meets the gas block
1/8/2010 7:13:16 PM EDT
[#1]
This should get you taken care of.

The "rust" should just be normal carbon and copper fouling.
1/8/2010 7:20:47 PM EDT
[#2]
Thanks for the timely response, again A+ service.