Had my HK MR556 apart for cleaning last night and noticed my piston sleeve is kinda funky looking. Couldn't find any other hi-res pics on the net to compare-- does yours look like this?
A forum dedicated to and laser-focused on Heckler & Koch firearms, Heckler & Koch accessories and the owners and enthusiasts that love them! Come join the discussion regarding HK pistols, long arms, NFA arms, HK accessories, HK history and trivia and more.