I really need sone help here. I have a LZ gem type air rifle. That has a . or what seems to be a 22 mach 2 chamber. Center fire. I did find where they made a kit to covert it into a 32 cal. Bit i can find nothing for the 17. The barrel is .177. And the chamber is .22. I got a 17 mach 2 round and pulled the head. It set off the primer just fine. Have any of you seen this chamber before.