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Windham Weaponry 450 Thumper, .450 Bushmaster, 16″, 5rd, Luth-AR MBA-1 Stock


Windham Weaponry’s 450 Thumper semi-automatic utilizes a gas impingement
system. The flattop upper receiver is forged 7075 T6 aircraft aluminum with
an aluminum trigger guard, carpenter 158 steel bolt, and manual lever
safety. The receiver is with laser engraved the caliber and has safety
indicator markings on both sides. The 450 Thumper has a 16″ chrome-lined
barrel made of 4150 Chrome Moly Vanadium 11595E steel with an A2 flash
suppressor. It has a Luth-AR buttstock with an adjustable buttplate and
cheekrest, WW free-float forend, and Hogue overmolded beavertail pistol
grip. It includes a 5-round magazine, black web sling, and hard plastic gun

Action :Semi-Automatic

Caliber :450 Bushmaster

Barrel Length :16″

Capacity :5+1

Trigger :

Safety :Lever

OAL :35.625″

Weight :7.2 lbs

Stock Description :Luth-AR MBA-1 Black

Metal Finish :Black Hard Coat Anodized

Muzzle :A2 Flash Suppressor

Receiver Material :7075 T6 Aluminum Forged

Sights :None, Optic Ready

Barrel Description :4150 Chrome Moly Vanadium Chrome-Lined

Twist :1:24″

Barrel Length Range :16.00″ to 17.99″

Weight Range :6.00 lbs to 7.99 lbs

Hand :Right

Stock Finish Group :Synthetic

Metal Finish Group :Blued/Black

Estimated shipping times are posted on the product information page under the title “Ships On Or Before:” please note that all lead-times are estimates.  For items in our warehouse, we usually ship within 3 business days.  For items only available at distribution or other sources, the ship time may be up to 10 business days.  For items only available at the manufacturer, the lead-time may be a few weeks or longer– depending on availability.

Please also note that some items are unique, hard to obtain, or one-of-a-kind, so Impact reserves the right to cancel your order should an item not be available to ship.

We will not charge your credit card until your product ships, except for certain special orders.

We normally will ship FedEx and US POSTAL. If you need faster shipment, we can ship 2nd Day or Next Day for an extra charge.

Alaska and Hawaii residents – your order MUST ship 2nd day or faster. Most orders over $100 value will ship with a signature-required to ensure they make it to you. Products that have free shipping only applies to the lower 48 states.

NOTE: We make every effort to get your order shipped as fast as possible. In some circumstances, especially during sales and after weekends, we may not get your order shipped in the time specified. Please rest assured that we will ship your item as soon as we can.

We want you to be 100% satisfied with your purchase from Multi Gun Shop, therefore we offer no hassle returns.

How do I start the return process?

  • Log in to your account and locate and click on the “Request Return” link.
  • An Multi Gun Shop agent will review your request for a return and respond within two business days.
  • All returns are subject to inspection and approval prior to refund being issued.
  • All products need to be in new and original manufacturer condition.
  • As an alternate method, you can send an email to Please be sure to include your original order number and relevant contact information.

When will I get my credit or return?

  • Most returns are fully refunded in 3-5 days after we receive and process the return. It may take longer for the credit to appear in your account depending on your bank. Most items that are in stock ship within 3-5 days after receipt of your returned item but may take longer depending on availability.
  • Returns must be charged back to the original credit card used in the purchase.  If this is not possible, we will refund you via check.

What about damaged/incorrect items?

  • If you received a damaged, defective, or incorrect item, Multi Gun Shop will ship you a replacement of the exact item upon receipt of the damaged or defective item. Multi Gun Shop will send you a return shipping label for the return.

What about return shipping costs?

  • If an Multi Gun Shop error causes the need to return an item or we are replacing a returned defective or incorrect item, then we will pay the associated shipping costs.
  • Otherwise, the customer is responsible for any return shipping costs. When returning an item, please add package tracking and adequate insurance.
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