Windham Weaponry .450 Thumper AR-15 Semi Auto Rifle .450 Bushmaster 16" Barrel 5 Round Magazine Free Float Hand Guard Luth-AR Buttstock Matte Black

Item No. FC-848037047564
Windham Weaponry .450 Thumper AR-15 Semi Auto Rifle .450 Bushmaster 16" Barrel 5 Round Magazine Free Float Hand Guard Luth-AR Buttstock Matte Black
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Brand: Windham Weaponry
MFR #: R16SFSL-450
UPC: 848037047564
Item #: FC-848037047564
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.


Windham Weaponry .450 Thumper .450 Bushmaster AR-15 Semi-Auto Rifle

Windham Weaponry is a name you can trust to build you an excellent quality AR-15 rifle, and if you are looking for a caliber that will take on all challenges, then the Windham Weaponry .450 Thumper is the AR for you. Built on the ultra-powerful .450 Bushmaster, while the rifle only has a five-round magazine, those five rounds will handle just about anything. Windham Weaponry, with their years of experience, is known for creating some of the best AR-15s on the market. You know they know exactly how to make a quality rifle that will stand up to adverse environments. If you are looking for an outstanding quality rifle at that economic price, then look no further than Windham Weaponry.

Windham Weaponry .450 Thumper AR Features and Specifications:

  • Windham Weaponry .450 Thumper AR-15 Semi Auto Rifle R16SFSL-450
  • Caliber: .450 Bushmaster
  • 16" Chrome-Lined Barrel (4150 Chrome Moly Vanadium 11595E Steel)
  • 1:24" Right-Hand Twist Rate
  • A2 Flash Suppressor
  • Direct Gas Impingement System
  • Flat-Top Upper Receiver (Optics Ready)
  • Lower Receiver 7075-T6 Aircraft-Grade Aluminum
  • Aluminum Trigger Guard
  • Bolt Is Carpenter 158 Steel
  • Luth-AR Buttstock with Adjustable Buttplate and Cheekrest
  • Windham Weaponry Free-Float Forend
  • Hogue Overmolded Beavertail Grip
  • Overall Length: 35.625"
  • Overall Weight: 7.2 lbs
  • 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.