I bought a Advantage Arms .22lr Law Enforcement kit for my Glock 19c. In the box it has a paper that says not to dry fire the Glock with this kit installed. Why is this? Also, it states not to use Federal or Remington "Thunderbolt" ammo. Has anyone tried using this ammo? Is that ammo too weak or too strong? Anyone else have any experience with a Advantage Arms kit on their Glock? I'll have some pics up tonight.