The MIL, Inc. Thunder 5 is a large, double-action revolver chambered in the .410-bore shotshell cartridge. It is also designed to fire the .45 Long Colt revolver cartridge. The revolver, somewhat unusual for the type of weapon, features a manual safety lever.

As the barrel is rifled, the Thunder 5 is not considered a short-barrelled shotgun under United States federal law

National Firearms Act

The National Firearms Act , 73rd Congress, Sess. 2, ch. 757, , enacted on June 26, 1934, currently codified as amended as , is an Act of Congress that, in general, imposes a statutory excise tax on the manufacture and transfer of certain firearms and mandates the registration of those firearms. The...

, but is under California statutes. However, a variant was produced in .45/70 Government that is legal in the aforementioned state. Production of the .45/70 variant started in 1994.

Sub-caliber sleeve inserts in 9mm Parabellum, .38 Special

.38 Special

The .38 Smith & Wesson Special is a rimmed, centerfire cartridge designed by Smith & Wesson. It is most commonly used in revolvers, although some semi-automatic pistols and carbines also use this round...

/.357 Magnum

.357 Magnum

The .357 S&W Magnum , or simply .357 Magnum, is a revolver cartridge created by Elmer Keith, Phillip B. Sharpe, Colonel D. B. Wesson of firearms manufacturer Smith & Wesson, and Winchester. It is based upon Smith & Wesson's earlier .38 Special cartridge. The .357 Magnum cartridge was introduced in...

 and .38 Super

.38 Super

The .38 Super or .38 Super Automatic is a pistol cartridge that fires a diameter bullet. The Super was introduced in the late 1920s as a higher pressure loading of the .38 ACP or .38 Auto. The old .38 ACP propelled a bullet at . The improved .38 Super Auto pushed the same bullet at...

were produced and available until 1998.