Benjamin Bulldog Magnum Series Bullpup design Precharged pneumatic 5 rd auto-indexing rotary clip in .357 and .257 3 rd gravity fed tray in .457 Sidelever Barrel Length (.357): 28.00" Barrel Length (.257/.457): 28.5" Overall Length (.357): 36" Overall Length (.257/.457): 36.3" SoundTrap baffle-less trapezoid-shaped sound suppression M18 threaded muzzle 26" long Picatinny optics rail 2-stage non-adjustable trigger (stage 1=2 lbs., stage 2=3 lbs.) Manual safety Ambidextrous synthetic stock Rubber recoil pad 3000 psi max fill pressure Cylinder size: 440cc (.357/.457) Cylinder size: 340cc (.257) Shots per fill: 5 shots (.357), 3 shots (.457), 8 shots (.257) Weight (.357/.257): 7.70 lbs. Weight (.457): 8.75 lbs. Reversible bolt -- switch from right to left side (with our special service) Foster male quick-disconnect fill fitting When you look for optical accessories, the Bulldog's manual states this: "Use of 37mm tall (Absolute Co-Witness) rings, widely used with the AR platform, are recommended." You may also use other sighting systems suited for AR platforms. Tech Tip: Some of the longer and heavier slugs will not fit into the .457 magazine and need to be single loaded. In our experience, this includes most slugs that are 350 grains and heavier.