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CMMG Inc. MK4 RCE AR-15 Semi Auto Rifle .300 BLK 16.1" Medium Weight Barrel 30 Rounds Aluminum KeyMod Handguard Collapsible Stock FDE 30AC39D-FDE

CMMG, Inc.
We regret that this item is not available at this time.
Can we ship this to you?
Typically ships within 1 to 2 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.
For over a decade CMMG has remained committed to producing some of the best AR platform rifles in the industry. With a spirit of staunch faith and unwavering dedication they are continually improving their products and processes. Its this firm sense of responsibility that brings you some of the most superb high quality American made rifles on the market today!

The Mk4 RCE is a premier rifle from CMMG's. This rifle features a 16.1" 4140 Chrome Moly medium taper profile barrel in .300 Blackout. The RCE is equipped with CMMG's own SV muzzle brake and an aluminum RKM14 KeyMod hand guard. This is an awesome AR-15 from that is not only great quality but its also set up in one of the best configurations you can get! The incredible Geissele SSA 2-stage trigger breaks like glass and a 6 position collapsible stock with adjust for any shooter or situation. The .300 ACC Blackout caliber is ideal for suppressed fire and lots of fun at the range but is also a versatile hunting cartridge. Whether you like plinking at the range for recreational shooting, you are a professional shooter that needs reliability and accuracy or youre a serious hog hunter, the MK4 RCE from CMMG is the only rifle you need!

Specifications and Features:
AR-15 Style Semi Automatic Rifle
.300 ACC Blackout
30 Rounds
16.1" Medium Weight Tapered Profile Barrel
4140 Chrome Moly Salt Bath Nitride with a 1:7 Twist
Threaded 1/2x28 TPI with a CMMG SV Muzzle Brake
Carbine Length Gas System
Forged 7075-T6 Aluminum Receivers
M4 Type Upper Receiver and AR15 Type Lower Receiver
Geissele Automatics SSA 2 Stage Trigger
CMMG RKM14 KeyMod 6061 T6 Aluminum Hand Guard
6 Position Adjustable Coll apsible Stock with Mil-Spec Receiver Extension
Magpul MOE Pistol Grip
Overall Length 34" Stock Collapsed
Weight 6.7 Pounds Unloaded
Flat Dark Earth Finish, FDE
Made In The USA

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 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 background check. 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.