Stock guns shoot from a low speed of 100 fps (feet per second) and up to 300 fps. Upgraded guns can reach velocities of up to 550 fps. Being hit by the pellets from a stock gun can be likened to a light sting and the hit will leave a small round welt. The hits are not so painful, but they are still noticeable even through regular clothing. But at pointblank range, it will break skin that is why eye protection is a must because even the guns with the lowest velocity can put out an eye.