I have a Ruger LCR in 22LR that does not always fire a round. I have tried a few different brands of ammo and out of 8 rounds in the cylinder 1 or 2 will not fire and appear to have light strikes on the rim. I do not know if it is a spring or firing pin issue, or maybe need a more detailed cleaning. Anyone know of some good info on resolving this issue or is this something that should go to Ruger for correction? The rounds that did not fire were tested in another pistol and they all fired without incident.