Styled mechanically after the Umarex PX4 Storm pellet pistol, the Gamo PT-85 also uses a double sided 16 round rotary pellet magazine to feed the .177 caliber pellets. The Gamo PT-85 also features a hard hitting blowback operation to give it a true semi auto feel and also has a rifled barrel for improved accuracy over a BB shooter. The PT-85 is very similar to teh Gamo P-25 but with teh addition of an accessory rail under the barrel.