Defense News has obtained images of what they refer to as the M1 Thumper — essentially an upgunned version of the M1 Abrams main battle tank. This new variant features a huge 140mm gun embedded in an enlarged turret as well as a supposed autoloader to handle the over-sized munitions. Its not clear if the US Army will give this ubiquitous version of the Abrams the go-ahead for full production and how effective the new gun is against some of the latest tanks being fielded by other adversarial nations.