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CMMG Mk4 A4 AR-15 5.56 NATO Semi Auto Rifle, 20" Barrel 30 Rounds, Black

CMMG, Inc.
We regret that this item is not available at this time.
Can we ship this to you?
Typically ships within 5 to 7 business days when a valid FFL is received
  • All firearm sales are final. NO RETURNS.
  • Return to manufacturer for warranty service.
  • Actual buyer must pickup from FFL dealer who will conduct the background check. Learn more
  • Firearm transfer must be the actual transferee/buyer. Click here to see BATFE form "Transaction Record Part 1".
  • Firearms are only available for purchase online.
A $10 handling fee will be charged per order. No additional charge for multiple firearms on an order.
CMMG's new AR-15, the MK4 A4 chambered in 5.56 NATO is designed to be a faithful recreation of the very same rifle issued to our armed forces. The M16 A4 has proven itself again and again on the battlefield against the enemies of freedom, allowing troops to do their jobs effectively and complete the mission with a rifle that is known for reliability in the harshest conditions.

The MK4 A4 is designed to allow us civilian shooters a chance to own the very same rifle that troops trust their lives to, not only is the MK4 A4 a fantastic choice for self-defense but it also makes for a superb target rifle with a high-quality 20" 1:7 twist chrome lined barrel. With features like an A1 length stock, forged 7075-T6 receivers and an included Magpul MBUS the CMMG MK4 A4 is ready to go to the range right out of the box. All that remains to make it the most faithful replica of an A4 M16 is to install a Knights Armament Drop-In Rail and the optic of your choice.

Specifications and Features:
CMMG Inc. 55A21A6
20" 1:7" Twist Barrel
Chrome Lined
A1 Length Fixed Stock
30 Round Capacity
Magpul MBUS Rear Sight
F-Marked Front Sight Post
Forged 7075-T6 Upper and Lower Recievers
A2 Pistol Grip
Mil-Spec Trigger
6.5 lbs. Unloaded
38" Long
Rifle Length Gas System

Buying a Firearm Online is Easy!
  • Add your selected firearm(s) to your shopping cart and check out.
  • Select a local Federal Firearms Licensed (FFL) Dealer that will accept the firearm and complete the transfer. Find a FFL Dealer HERE.
  • If you choose an FFL Dealer that is not on our preferred list, you or your FFL Dealer will be required to fax or email us a signed copy of the Federal Firearms License referencing your Cheaper Than Dirt! order number. Download the Firearm Sales Form
  • Pick up your firearm from the FFL Dealer, who will need to do a criminal and mental health background check. Transfer fees may apply.
Buying Firearms on the Internet

Federal law requires firearms to be shipped to FFL Dealers. For an individual to receive a firearm from Cheaper Than Dirt! it must be shipped to an FFL Dealer in your state.

Locating a Federal-Firearm License Dealer (FFL) in Your Area

There are thousands of FFL Dealers in the United States. You may choose an FFL Dealer from our preferred listing or you may find a dealer in your area. To find a list of FFL Dealers in your area area CLICK HERE. If you choose a dealer that is not on our preferred list, either you or the FFL Dealer will be required to submit a copy of the Federal Firearms License referencing your Cheaper Than Dirt! order number. The FFL Dealer will usually charge a fee to conduct the transfer. There are duties that the FFL Dealer is required to do during the process which include a criminal and mental health background check through NICS. Remember, the FFL Dealer is doing you a favor and the process takes time to complete. Fees can vary so check with the FFL Dealer ahead of time to request a quote on the fees associated with your firearm transfer. The FFL Dealer is in business to make a profit and your internet purchase may be viewed as competition to their retail business. If you feel the fees are too high, you can search for another FFL Dealer.

Completing the Transaction

Once you place the firearm in your cart and checkout you will receive a confirmation email that has your order number and further instructions. We will verify the FFL license and also make the FFL Dealer aware that an order from Cheaper Than Dirt! will soon be arriving for you. Most orders are processed within 2-3 business days from the time we receive and verify the FFL Dealers information. Once shipped, your firearm will arrive at the FFL Dealer within 3-7 days business days. The FFL Dealer will begin processing the shipment. It may be an additional day or so before the FFL Dealer is ready to conduct the transfer of the firearm to you. Call the FFL Dealer and set an appointment to confirm that the firearm is ready to be transferred.

Please note! All Firearm Sales are Final

It is important to thoroughly inspect your firearm before completion of the transfer. Once the firearm is transferred into your name, Cheaper Than Dirt! will not accept a return or exchange under any circumstance. If a defect is discovered after completing the transfer, you must contact the manufacturer directly for repair or replacement.