Gun Report

Spider Firearms Ferret 50 .50 BMG

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We do not recommend this AR-15 .50 BMG conversion because of the very slow reload time when a dead primer is experienced. That may not happen every time you shoot it, but you can generallycount on things like that happening at the worst possible time, and then the limits of the design make themselves known. The rifle had acceptable accuracy, but for a little more money, you can get the most accurate rifle in the test. If you like the idea of beingable to acquire a .50-BMG upper directly from the manufacturer without a lot of hassle and paperwork, the Ferret might be worth a look, but we didn't much like it.

Spider Firearms Ferret 50 .50 BMG

Gun Details

Model Name
Model Number
Caliber Plus Cartridge
Weight Unloaded
Length of Pull
Action Type
Action Finish
Barrel Finish
Trigger Pull Weight

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The Ferret 50 is not a complete rifle, but instead is a complete AR-15 upper receiver, including barrel, bolt, scope rail, and bipod. Attach a good lower AR-15 receiver, and you have a complete rifle.
We tried both a DPMS lower (left) and a standard Rock River lower (right). Both held up to the punishment of the big cartridge.
We felt this rifle had the best bipod. Its legs were adjustable to a length that was short enough to permit shooting in a comfortable seated position.
The muzzle brake was designed differently than the others tested, but it produced a similar shock wave for the bystanders.

Read Gun Tests Rating and Recommendation