I bought the CMMG kit and it was fun but if I shot Winchester or Remington ammo, the gun would get dirty after 75 rounds or so and start jamming. I think it did better with CCI ammo, but would still get dirty eventually and jam. My main issue was when I wanted to fire 223 ammo I had to go to the trouble to re zero the scope and just preferred using my dedicated 22 rifles for leaking with anyway.