This gun is the ultimate in BB Airguns, when modified it can shoot BBs at over 700fps and at 1200 rounds per minute. It has an internal hopper that holds close to 1000 BBs, when you add compressed air this gun is ferocious! Mine has been modified with the JimC. custom barrel, picatinny rails with mounted fore-grip - laser site, tactical light. I have also added a Red Dot scope, bulk airi kit, and the 1200 rounds per minute full auto mod chip.