Benjamin Bulldog Magnum Series Bullpup design Precharged pneumatic 5 rd auto-indexing rotary clip Sidelever Barrel Length: 28.00" Overall Length: 36" SoundTrap baffle-less trapezoid-shaped sound suppression 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 Shots per fill: 5 shots Weight: 7.70 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.