Interestingly enough I have a Match Target MT6400 that was made by Colt Defense
Searched high and wide for that one, I'm usually not a rollmark junkie, but I wanted a clone of the rifle I carried on my first deployment- a Colt Defense marked M4 Carbine. At the time, the MT6400C was the only with that rollmark. Also had "BURST" engraved on the lower, as well as all three selector markings on the right side. My first SBR, too- 14.5" on the Form 1, like I said, I wanted it as close as humanly possible.
Trolled Gunbroker for months asking every seller that had an MT6400C for sale whether it was marked COLT'S MFG or COLT DEFENSE.
Think I did a pretty decent job cloning.
Both Surefires were used over there, and I've since Form 1ed a 6920 lower, and since my setup has evolved sine 2008, the MT6400C will be back to full "clone" status once my TA01NSN/TRD gets back on the slow boat.