The Winchester Model 1897 and the Winchester Model 1893 were both designed by John Browning. The Model 1897 is an external hammer shotgun lacking a trigger disconnector. This means that the user can hold the trigger down while cycling the shotgun and once the action is returned to battery the shotgun fires.[8] The firearm itself is classified as a slide action pump shotgun. It was the first truly successful pump-action shotgun produced. Throughout the time period the Model 1897 was in production, over a million of the type were produced in various grades and barrel lengths. 16-gauge guns had a standard barrel length of 28inches, while 12-gauge guns were furnished with 30-inch length barrels. Special length barrels could be ordered in lengths as short as 20inches, and as long as 36inches. Along with various grades and barrel lengths, the Model 1897 came in two different chamberings. One was the 12 gauge and the other was the 16 gauge.[8] The shells should be of the ​23⁄4 inch or ​25⁄8 inch model.[3] Any shells larger are not recommended. An average Model 1897 can hold 6 shotgun shells in the magazine tube.[9] When working the action of the Model 1897 the forend (fore grip) is pulled back, forcing the breech bolt to the rear which extracts and then ejects the spent shell while simultaneously cocking the external hammer by pushing it to the rear. When the forend is slid forward again, the breech bolt pushes a fresh shell into the gun's chamber and locks into place.