However, Pedersen is remembered for a few highly noteworthy firearms innovations and designs. His attempts to gain military contracts for his gun designs were marred mostly by bad timing and bad luck.
For example, his .45 pistol design was approved by the U.S. Navy but it ultimately lost out to the M1911 pistol already being manufactured for the Army. His semi-auto rifle design also lost out to the now iconic Garand rifle.
His Pedersen Device was perhaps his most ambitious design and could have made a significant impact during WWI. It was an invention attached to a M1903 Springfield bolt-action rifle that allowed the rifle to operate as a semi-automatic. Unfortunately for Pedersen, the device was approved for production just as the war was ending.
But as something of a moral victory, General George S. Patton owned one of Pedersen's pistols, the Remington Model 51. Patton was thought to have favored the pistol as his personal sidearm and it can be seen in many photographs of the General.
Pedersen also attempted to mass produce M1 carbines for the military during WWII, via his own company, the Irwin-Pedersen Arms Company, but that endeavor also failed.
Civilian market
Pedersen actually collaborated with Browning, when Browning made the principle design for the Remington Model 17 pump-action shotgun. Pedersen altered Browning's design before production by the Remington Arms Company in 1921. The 20-gauge shotgun featured a tubular magazine, bottom-loading and bottom-ejecting portals, and it was hammerless. The Model 17 later became the Remington Model 31, Ithaca 37 and Browning BPS, all very successful shotguns in the civilian market.
Pedersen either designed directly or had a hand in just about every firearm that Remington produced from 1903 to 1940. He was prolific, earning at least 69 patents for his firearms designs. These included the Model 12, 14, and 25 pump-action rifles, and the Model 10 pump-action shotgun.
It could also be fairly said that Pedersen had an indirect hand in the design of the famous Remington 870 pump-action shotgun, in that several of his design elements are present in that famous gun.