Quiet hit the nail on the head ! The LEO marked rifles and various pistol mags were for during the ban. Auto or burst are not marked this way!
Colt still marks some LEO, they are intended for semi contract buys for law enforcement agencies.
Please note that if Obama wins, by February, it goes back to 1994-2004 regs and anything marked thusly will not be available for civilian sales .
VOTE.............