Description
The Colt M4 Commando CR6933 SBR
When you need a short-barreled rifle that works every single time, you go with the name that’s been there from the beginning. The Colt M4 Commando CR6933 isn’t just another AR-pattern SBR. This is the direct descendant of the rifles carried by professionals who depend on their gear in the most demanding conditions. With an 11.5-inch barrel and overall length under 31 inches, it delivers 5.56mm performance in a package that’s maneuverable in tight spaces without sacrificing terminal ballistics.
What Makes This Colt SBR Different
Plenty of companies make short-barreled ARs, but the Colt CR6933 stands apart because it’s built to military specifications, not commercial approximations. The 1:7 twist rate in that chrome-lined barrel is optimized for heavier 5.56mm rounds that maintain velocity and stability even from the shorter barrel. The closed bolt semi-auto action provides consistent lockup and reliable feeding that you can count on round after round. This isn’t a range toy dressed up to look tactical—it’s a serious tool engineered for serious use. The lifetime warranty from Colt means this rifle will outlast whatever you put it through.
Specifications
- Manufacturer: Colt
- Model: M4 Commando CR6933
- Caliber: 5.56mm
- Action: Semi-Auto, Closed Bolt
- Barrel: 11.5 inches, 1:7 Twist
- Overall Length: 27.5 to 30.75 inches
- Thread Pitch: 1/2×28
- Weight: 6 pounds 3.36 ounces
- Color: Black
- Magazine Capacity: 30 rounds
- Warranty: Lifetime
Why This SBR Works for Arizona Shooters
Here in Arizona, we understand that different terrain calls for different tools. The Colt CR6933’s compact size makes it ideal for vehicle use or navigating through brush and tight canyon spaces where a full-length rifle would be cumbersome. The 5.56mm chambering means you can share ammunition with your other AR-platform rifles, and the 11.5-inch barrel still delivers effective performance at typical Arizona engagement distances. Whether you’re on ranch property, at one of our desert shooting areas, or preparing for home defense in tighter urban spaces, this Colt gives you capability without compromise. At tucsonarms, we’ve seen firsthand how this platform performs in our unique environment.
Other SBR Options
If you’re considering different SBR configurations, we carry several other quality options. For those interested in the 300 Blackout caliber, the Q Minifix SBR offers exceptional suppression capabilities. If you prefer something with more historical pedigree, the FN PS90 SBR provides a completely different bullpup experience. And for those who want top-tier custom quality, the Noveske Gen 4 N6 Leonidas SBR represents the pinnacle of precision manufacturing.
Built to Last
Colt’s reputation wasn’t built on marketing—it was built on rifles that work when it matters. The CR6933 continues that tradition with quality materials, proper heat treatment, and attention to detail that commercial manufacturers often skip. From the properly staked gas key to the correctly torqued barrel nut, this rifle is assembled right. The 11.5-inch barrel length represents the sweet spot for 5.56mm SBRs, providing enough dwell time for reliable operation while keeping the package compact. The 1/2×28 thread pitch accepts standard muzzle devices, and the M4 feed ramps ensure smooth cycling with a variety of ammunition types.
NFA-Regulated Firearm — ATF Form 4 Required
This is a short-barreled rifle (SBR) regulated under the National Firearms Act. Purchase requires an ATF Form 4 transfer, a $200 federal tax stamp, and approximately 30–120 days of ATF processing (eForm 4 is typically faster than paper). The firearm ships to a licensed FFL/SOT dealer of your choice; you take possession only after ATF approval.
SBRs are currently legal to own in most U.S. states. They remain prohibited or restricted for civilian possession in California, New York, New Jersey, Washington D.C., Hawaii, Iowa, Rhode Island, and Washington State. Check your state and local law before ordering. By placing an order you affirm that possession is lawful in your jurisdiction and that you are 21+ with no prohibiting factors under 18 U.S.C. §922(g).
Questions about Form 4, trust setup, or SOT transfer? Contact us before you order — we’ll walk you through it.
Frequently Asked Questions
What's the NFA process for buying this SBR?
We handle all the paperwork for you. You'll complete a Form 4, submit fingerprints and photos, and pay the $200 tax stamp. Once approved, we ship to your chosen FFL for pickup.
How long does the NFA approval take?
Current processing times for Form 4 approvals average 6-9 months. We submit everything electronically to speed up the process, but the ATF determines the final timeline.
Do you ship to Arizona FFLs?
Yes, we ship to any licensed Arizona FFL dealer. You choose the FFL, we handle the transfer paperwork and shipping. Most Arizona shops are familiar with our transfers.
Why choose 5.56mm in an SBR versus 300 Blackout?
5.56mm offers better long-range performance, wider ammunition availability, and compatibility with your existing AR magazines and parts. For suppressed use under 100 yards, 300 Blackout excels, but 5.56mm is more versatile overall.
Mike R. (verified owner) –
This Colt runs flawlessly with every type of ammo I’ve tried. The 11.5-inch barrel is perfect for my side-by-side when checking fence lines. Worth the NFA wait.
Sarah L. (verified owner) –
Solid build quality, exactly what I expected from Colt. Slightly heavier than some modern SBRs, but that weight translates to durability. Great for northern Arizona terrain.
Carlos M. (verified owner) –
Had this for six months now—zero malfunctions through 1,200 rounds. The shorter length makes it much easier to maneuver in my truck. Colt reliability is real.