I searched around the forums and Ruger's FAQ, but didn't find current info for the compatibility of CCi Stingers and the LCP II. There seems to be different opinions on the web, but here is the official from Ruger. This may be old info for some, but just in case there are new owners looking for the answer.
"It is safe to fire the CCI Stinger .22LR in the LCP II .22LR Pistol. We recommend ammunition for this pistol that is rated at 1200 feet per second or higher.
Thank you for your interest in Ruger.
Ruger Customer Service"
Good news for the hyper ammo, bad news for the std velocity... will try some of each very soon
"It is safe to fire the CCI Stinger .22LR in the LCP II .22LR Pistol. We recommend ammunition for this pistol that is rated at 1200 feet per second or higher.
Thank you for your interest in Ruger.
Ruger Customer Service"
Good news for the hyper ammo, bad news for the std velocity... will try some of each very soon