The United Kingdom’s Army is upgrading their Challenger-2 battle tanks with new armor and a new gun, the same gun used on the M1A1/2 Abrams; the German designed 120 millimeter (mm) Rheinmetall smoothbore, which launches various types of combustible cased rounds (various projectiles on a combustible plastic case with a metal base/’af-cap’).

The gun on the current Challenger-2 is also 120mm, but the British designed tube (barrel) is rifled and the ammo consists of a projectile which is loaded separately from the combustible case/bagged propellent.

A Royal Wessex Yeomanry Challenger-2 on Sennelager Training Area, Germany.

To prep the Royal Wessex Yeomanry on how to operate the Rheinmetall gun, Montana’s 1-163rd Combined Arms Battalion (part of the Idaho based 116th Cavalry Brigade Combat Team, aka Snake River Brigade) is training the Red Coat tankers by letting them shoot-up the Montana mountains.

Montana Army National Guard’s video report (recorded 16MAY2025 on the Limestone Hills Training Facility, released 17MAY2025):

The new upgraded Challenger is called the Challenger-3.

A Royal Wessex Yeomanry Challenger-2, on the Sennelager Training Area, Germany.

Cold War to Battle for Ukraine: Challenger, a child of Serendipity? (from the Iranian Shir-2 to the Challenger-3)