Colt Defense CR6933 M4 Commando 11.5 inch 5.56 NATO Factory SBR, Chrome-Lined 1:7, Folding Rear Sight, 3 PMAGs, Box
This factory SBR is a Colt Defense CR6933 M4 Commando in 5.56 NATO with an 11.5 inch chrome-lined Cr-Mo-V barrel and a 1:7 RH twist. It features a flat-top upper with a T-marked rail (T2–T12 visible) bearing Colt CAGE code 13629, forged hard-anodized receivers, an A2 front sight base with bayonet lug, and a metal folding rear BUIS. It comes with three 30-round PMAG GEN M3 magazines with Magpul Ranger Plates and a Colt factory box labeled for CR6933/LE6933; the carton label serial matches the receiver.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Scratches and blemishes are present, including finish wear between the upper and lower receivers. The muzzle device shows carbon buildup. The bore presents a bright interior.
What’s Included
- Colt factory cardboard box with end label referencing CR6933/LE6933
- Three 30-round Magpul PMAG GEN M3 polymer magazines with Magpul Ranger Plates installed
- Metal folding back-up rear sight (installed)
- Non-A2 multi-port muzzle brake/compensator (installed)
The CR6933 is a true Colt factory SBR built on the AR-15 platform with semi-automatic, direct-impingement operation. Its 11.5 inch barrel is chrome-lined Cr-Mo-V steel with a 1:7 RH twist, suited for standard 5.56 NATO loads. The barrel is threaded and fitted with a non-A2 multi-port brake/compensator.
The upper is a flat-top receiver with T-marked rail positions (T2–T12 visible) and Colt CAGE code 13629. The front sight is an A2 sight base with bayonet lug, paired with a metal folding rear BUIS. Carbine-length two-piece M4 polymer handguards complete the front end.
The receiver set is forged aluminum with a hard-anodized finish. The lower shows the Colt pony over globe and the legend "CARBINE CAL. 5.56 MM," and the selector is marked SAFE/FIRE. A collapsible 6-position stock and manual safety are standard.
This rifle includes three 30-round PMAG GEN M3 magazines with Magpul Ranger Plates and ships in the Colt factory cardboard box that references both CR6933 and LE6933. The carton label serial matches the receiver, aligning the packaging to the firearm.