105mm Gun T8 was an anti-tank gun developed in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 in mid 1940s. The development started in October 1944; the gun reached trials in February 1946. Soon afterwards the project was cancelled.

Two pilot pieces were built; one of those is on display in the United States Army Ordnance Museum

United States Army Ordnance Museum

The U.S. Army Ordnance Museum is a museum that is in the process of being re-located to Fort Lee, in Fort Lee, Virginia. Its previous building—at Aberdeen Proving Ground in Aberdeen, Maryland—was closed in September 2010, although many outdoor exhibits are still accessible to the...

, Aberdeen

Aberdeen, Maryland

As of the census of 2000, there were 13,842 people, 5,475 households, and 3,712 families residing in the city. The population density was 2,166.2 people per square mile . There were 5,894 housing units at an average density of 922.4 per square mile...

, Maryland

Maryland

Maryland is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east...

, United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

.

The T8 weighted about eight tons. It had a split trail

Split trail

The split trail is a type of gun mount or gun carriage for relatively small and transportable artillery pieces....

 carriage and magnesium

Magnesium

Magnesium is a chemical element with the symbol Mg, atomic number 12, and common oxidation number +2. It is an alkaline earth metal and the eighth most abundant element in the Earth's crust and ninth in the known universe as a whole...

 wheels with synthetic rubber

Synthetic rubber

Synthetic rubber is is any type of artificial elastomer, invariably a polymer. An elastomer is a material with the mechanical property that it can undergo much more elastic deformation under stress than most materials and still return to its previous size without permanent deformation...

tires. In transportation, the mount could be rotated 180 degrees in order to reduce the length of the piece.

The gun fired a 17.7 kg (39 lbs) AP projectile at 945 m/s (3,100 ft/s), resulting in the penetration of 210 mm (8.26 in) at 1,000 m (1,093 yds), 0 degrees.