My Hk MR556 came from the factory with a F/A hammer and trigger group, just the S/A selector. So I suppose it is legal. They have the BCG designed just a tad different and that is why the BATF let it slide...
" The strongest reason for the people to retain the right to
keep and bear arms is, as a last resort, to protect
themselves against tyranny in Government...." - Thomas Jefferson
Last edited by CharlieDeltaJuliet; January 18, 2013 at 08:29 PM.