.45 Remington–Thompson

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.45 Remington–Thompson
Place of origin Experimental military round
Production history
Designed 1923
Parent case .45 ACP
Bullet diameter .447 in (11.4 mm)[1]
Overall length 1 inch

The 45 Remington–Thompson was an experimental firearms cartridge designed by Remington Arms and Auto Ordnance for the Model 1923 Thompson submachine gun, a variant of the Model 1921 with a longer barrel, with the intent of increasing the power and range of the weapon.[2][3] While some variants of the 1923 were produced, the rifle and round did not find commercial success.[3]