I recently purchased a Sig Sauer .22 Mosquito. I have been having multiple feeding problems with it. These issues happen with both the original magazine and the additional one I picked up at Academy. The problems: Fail to Extract - Rounds will fire but occasionally fail to extract. It's as if the slide doesn't cycle after firing. Fail to Feed - The round fires and extracts but the next round doesn't get picked up and fed into the breech. The gun seems to have fully cycled, but I drop the hammer on an empty chamber. Stovepipes - Just as it sounds. The round fires and extracts, but the slide closes on the case. Sometimes the case is horizontal to the breech, sometimes it is vertical. Some magazines feed without issue some have up to 5 various failures during the mag. (Both mags.) Ammo: Federal value pack - 36 gr. copper plated hollow point listed velocity 1260 fps@ muzzle. CCI Mini-Mag - 40 gr copper plated RN rated at 1235 fps. Remmington Value pack - Tossed the box but it was comparable to the others listed. I have tried swapping the return spring with the heavier one that came with the gun. This spring is supposed to be used with "Hyper Velocity" rounds. With the heavy spring the slide will not cycle when shooting the lower velocity rounds. This I would expect as the lower power rounds won't have the "Omph" to compress the spring. I have dis-assembled both mags. Cleaned and lubed them with a dry silicone spray (Super Lube). I also cleaned up the burrs on the follower in the second mag. The follower on the original mag was burr free. Still having problems. Out of 250 rounds today using the Federal ammo, I had roughly 40 failures of the various type. I have approx. 900 rounds total through the gun so far. Any Ideas?