This is a civilian legal short barrel rifle (SBR). The SBR is civilian legal; however, because it is classified as a National Firearms Act (NFA) weapon, it requires registration with the BATFE.
Colt Advanced Law Enforcement Carbine Model LE6945CQB . This 10.3" short barrel rifle comes with Magpul MBUS rear sight, folding front sight, one piece monolithic upper, 4-position picatinny rail, cleaning kit, two steel magazines, and sling.
Colt restricted SBR sales to LE/Mil agencies only and availability is limited.