Product Description Colt M4 Carbine LE 6921 Flat Top 5.56 AR-15 SBR - 14.5" - USED Police Trade In Colt M4 Carbine LE 6921 Flat Top 5.56 AR-15 SBR - 14.5" - USED Police Trade In at Primary Arms Browse all Primary Arms deals $799.99 In Stock at Primary Arms Price verified 3d ago Buy Now at Primary Arms Secure checkout Easy returns or compare prices Amazon eBay Product Details Brand Colt Colt