This Savage a17 semi rifle comes with bushnell rimfire optics3-9x40mm scope and 1/ 25 round magazinSavage® designed the A17 Semi-Auto Rimfire Rifle with a unique delayed-blowback action specifically to cycle the 17 HMR cartridge. A special lug locks the bolt in place for a millisecond, allowing most of the gases from burning powder to dissipate before the bolt starts its rearward motion.