This invention concerns an end plate for an ammunition chamber to be inserted into the handle of a pistol from below. The catalyst system of the present invention comprise a substrate and a washcoat, wherein the washcoat comprises at least one oxide solid, wherein the oxide solid comprises one or more selected from the group consisting of a carrier material oxide, a catalyst, and mixtures thereof. The interactive media guide may include a provider of user-generated content populated with user-generated content according to the user’s interests or most recently added to the provider. In other embodiments, lamp cooling is adjusted to maintain a wall temperature of the arc tube below a softening temperature. Thus, the system updates and maintains new weights of features andor feature elements.