Slide action Model 25 Peerless, was a fancy version of Model 24 and Model 25A, which was a trap model. Manufactured from 1902 to 1913 in 12- or 16-gauge, with 24", 26", 28" or 32" steel or Damascus barrels. Gun had unique double trigger. Front trigger cocked and decocked an internal firing pin and back trigger fired the gun. Gun is marked on left side of frame and pump release is on right side. Model had one serious drawback, the slide that extracted a spent shell extended back over comb of stock. This often hit shooter's thumb knuckle and caused injury. In 1907, Union redesigned their slide by reducing its length and shielding it behind a steel plate that covered rear half of opening. These are Model 24, 25 and 25A improved versions. Approximately 17,000 of all models combined were made.