The GMB/A is an advanced adaptor bar system that provides versatility for camera rigs. It features vertically and horizontally adjustable braces that can perfectly align a matte box with a turn of a knob. The top adaptor plate slides back and forth to accommodate different lens lengths and can be removed for easy camera mounting. When not in use, the system retracts to a compact size. Key features include adjustable support bars, a sliding backplate for camera attachment, and compact storage.