Manufactured in 1966, the fourth year of SP1 rifle production at Colt. Features standard markings on the slab side lower receiver, with three-prong flash hider on the "S 12" marked barrel, standard post front sight on the "A" frame gas block with bayonet lug, windage adjustable flip up two-leaf rear peep sight on the upper receiver with fixed carry handle, no forward assist, short deflector, unserrated bolt carrier with chrome plated firing pin and standard retainer pin, and two-piece buffer. Fitted with a checkered pistol grip, long vented triangular handguard, fixed buttstock with ribbed rubber buttpad, and magazine with "COLT AR-15" on the floorplate. The included factory letter confirms the rifle's current configuration with 20 inch barrel chambered for .223 Rem., black anodized receiver and black oxide barrel finishes, black composition nylon stock, and furnished with a rear sight adjustable for windage and a front sight adjustable for elevation noted as special features, when sent in a shipment of three rifles to Kesselring Gun Shop off U.S. 99 Route No. 1 in Burlington, Washington, on August 2, 1966. Also includes a "COLT'S 62316" marked M7 bayonet, M8A1 scabbard numbered "63619" in sharpie, black web sling, and Colt AR-15 sporter rifle manual.

Excellent, retaining 97% plus original black anodized and oxide finishes with some minor brown patina/spotting showing on the gas block, front takedown pin, and rear sight windage knob, but otherwise limited minor handling marks. The furniture is also excellent with a few minor white streaks in the rubber butt. Mechanically excellent. The bayonet is very fine with some minor spotting and sharp edge. The scabbard is rough.