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seriously? you want to put a badly made cheap chineese camera thats image quality isnt great incharge of capturing footage for 1000s in firearms . seriously the cameras i suggested are in the 4-600$...

most alarms can be setup with an expander on the main alarm if you are low on zones and also have a separate partition with their own keypad or configure a keypad to swap between partitions

look at axis or hik vision cameras they are self contained and use a sd in the camera lots of models provide atleast 720p recording if not full 1080 you can run them off a poe injector in your home...