This is a 1/64 (scalable to other scales: 89% for 1/72, 84% for 1/76, 64% for 1/100, 74% for Ho Scale, 114% for 1/56, 133% for 1/48) scale model of the Challenger 3 (CR3), is a planned third generation British main battle tank in development for the British Army. It will be produced by conversion of existing Challenger 2 tanks by the British/German Rheinmetall BAE Systems Land joint venture.

Improvements to Challenger 2 began in 2005 as the Capability And Sustainment Programme (CSP) to keep the Challenger 2 competitive until the 2030s. Lack of funding meant that it wasn't until 2014 that the programme was formally reorganised into the "Challenger 2 Life Extension Programme" (LEP). In response to the LEP programme, two prototypes were submitted for evaluation; one from BAE Systems in 2018 and the other from Rheinmetall in 2019.[13] Later that year BAE and Rheinmetall merged their British operations into Rheinmetall BAE Systems Land (RBSL), effectively leaving Rheinmetall's proposal the only option available without replacing the Challenger 2 fleet with non-indigenous models.

The Challenger 3 has an all-new turret with an improved hull. The most significant change from Challenger 2 to Challenger 3 is the replacement of the Challenger's main armament from a 120 mm L30A1 Rifled main gun to the 120 mm L55A1 smoothbore gun (which itself is an upgraded version of the L55 fitted to the Leopard 2A6/A7 family of main battle tanks) giving commonality with other NATO members. It is the first British built tank that doesn't have a rifled main gun from its inception.

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