The Snake Slayer IV has a4 1/4 long barrel (versus 3 1/2 barrel).This longer barreled Snake Slayerprovides tighter shot patterns, highervelocities, and even more manageablerecoil than the original Snake Slayer. TheSnake Slayer IV will accept all the extrainterchangeable barrels and also has theextended grips for added comfort. 4 1/4 barrel. Interchangeable Barrels. Automatic Extractor. (EXCEPT FOR 9mm,40S&W,10mm and .45 ACP). Rebounding Hammer. Retracting Firing Pins. Crossbolt Safety. Spring-Loaded Cammed Locking Lever. (for a tighter barrel/frame fit and Rapid loading and unloading). Trigger guard. Stainless Steel with Satin Polish Finish.