The Winchester Model 99, also known as the Winchester Thumb Trigger Model, is an American single-shot bolt-action rifle.
The rifle was produced from 1904 to 1923, originally known as the Winchester Thumb Trigger Model. The concept of a thumb trigger rifle was a rifle for clients with hand problems, such as having fingers amputated or having birth defects; the Thumb Trigger Model was made and marketed as a boy's rifle, so that boys could go plinking or varmint hunting, with the notion of the thumb trigger being that it was cheaper to manufacture, and purportedly helped increase the accuracy of the weapon as there was no rearward pull of the trigger to distort aim. In 1920, the rifle was renamed to become the Winchester Model 99, and it stayed that way until 1923 when the rifle was discontinued.
The thumb trigger system of the rifle was patented by Thomas Bennett. Winchester later used his patent to create the Model 99.