I have one and it eats any ammo, even Remington, that I run through it. Disassembling the mags, cleaning, and a light oil will usually take care of any feeding and/or jamming problems. As stated, the .22lr is not high on the self-defense list, but, as many experts say, " Any gun is better than no gun." Foot pounds of energy, expansion, and penetration are the key elements of self-defense. Of course shot placement is at the top of the list. When it comes to .22LR, ammo choice can be a real eye-opener. Some 22LR ammo only has 68 ft.lbs, of energy. On the opposite end of the spectrum, Aguila Supermaximum, 30 gr. Round nose has 204 fps. of energy. Stay away from hollow points in 22 LR. They dont expand enough to really make a difference. Round nose will give better penetration and therefore more beneficial in 22lr. A center neck, or head shot in a 22LR with this ammo, will have better results than 9mm, 40 cal, or .45acp in a poorly placed shot, like a shoulder or non-vital area. Keep in mind that the fps. of energy of any given ammo is much higher in a rifle than in a pistol. The longer barrel length of a rifle contributes more compression , therefore more velocity and ftps. of energy. Shoot some cheap 22lr. ammo, then try the Supermaximum. I think you will be impressed. In a shtf scenario, I would greatly prefer my 7.62, but if it were my M&P 15-22 or nothing, I'll take the 15-22.