Rock River Arms CM Mid-Length A4 .450 Bushmaster Semi Auto Rifle 16" Barrel RRA 13" Free Float M-LOK Hand Guard Carbine Stock Matte Black

Item No. 7-G450B1542
Rock River Arms CM Mid-Length A4 .450 Bushmaster Semi Auto Rifle 16" Barrel RRA 13" Free Float M-LOK Hand Guard Carbine Stock Matte Black
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  • In Stock
Our Low Price $1,057.94
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Brand: Rock River Arms, Inc.
MFR #: 450B1542
UPC: 842834125562
Item #: 7-G450B1542
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 $15.99 handling fee will be charged per order. No additional charge for multiple firearms on an order.


The Rock River Arms Cm mid-Length A4 LAR-15M is Chambered in the Powerful .450 Bushmaster

Rock River arms is excited to offer a new AR-15 variant designed specifically to shoot the .450 Bushmaster cartridge. This particular model comes standard with a 16" chrome moly barrel and a RRA Operator Brake. The receiver is made from forged aluminum with a hard coat anodized finish. A Rock River Arms 13" Extended Lightweight free float rail features a full length picatinny rail and a M-LOK compatible system located at the 3, 6, and 9 o'clock positions. A carbine A2 pistol grip and 7 round Ar-15 .450 bushmaster magazine round out the list of features. This rifle features a black finish.

Rock River Arms LAR-15M CM Mid-Length AR-15 Semi Auto Rifle(Black) Specifications and Features:

  • Rock River Arms 450B1542
  • Direct Gas Impingement Semi Automatic Rifle
  • .450 Bushmaster
  • 16" Chrome Moly Barrel
  • 5/8x32 Thread Pitch
  • RRA Operator Muzzle Brake
  • Forged RRA LAR-15M Multi Caliber Marked Lower Receiver
  • Forged A4 Upper Receiver
  • Mid-Length Gas System
  • Low profile Gas Block
  • RRA Two Stage Trigger
  • RRA Winter Trigger Guard
  • Standard Charging Handle
  • RRA 13" Extended Lightweight Free Float Hand Guard (M-LOK Compatible with Picatinny Top Rail)
  • RRA Operator Carbine Stock
  • RRA Overmolded A2 Grip
  • 7 Rounds
  • Accepts Standard Pattern AR-15 Magazines (.450 Bushmaster)
  • 1 MOA at 100 yards
  • Overall Weight 6.8lbs
  • Overall Length 37.5"
  • Matte Black Finish
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.