French Canadian-born Garand went to work at the United States Army's Springfield Armory and began working on a .30 caliber primer actuated blowback Model 1919 prototype. In 1924, twenty-four rifles, identified as "M1922s", were built at Springfield. At Fort Benning during 1925, they were tested against models by Berthier, Hatcher-Bang, Thompson, and Pedersen, the latter two being delayed blowback types. This led to a further trial of an improved "M1924" Garand against the Thompson, ultimately producing an inconclusive report. As a result, the Ordnance Board ordered a .30-06 Garand variant. In March 1927, the cavalry board reported trials among the Thompson, Garand, and 03 Springfield had not led to a clear winner. This led to a gas-operated .276 (7 mm) model (patented by Garand on 12 April 1930).