| CPC F41A 9/60 (2013.01) [F41A 15/00 (2013.01)] | 20 Claims | 

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               1. A firearm shell casing catching system for collecting casings ejected from a firearm, the firearm having an ejection port and a receiver, the firearm shell casing catching system comprising: 
            a mounting assembly selectively attachable to a firearm receiver, the mounting assembly comprising a rear tab, a first side wall defining a first inside surface, a front wall defining a second inside surface, and a second side wall defining a third inside surface, wherein the front wall has a top surface and a bottom surface, wherein the top surface defines a top socket and the bottom surface defines a bottom socket; 
                a shim selectably attachable to the mounting assembly, having a body, an upper flange, and a lower flange, wherein the upper flange comprises an upper protrusion, wherein the lower flange comprises a lower protrusion, wherein the upper protrusion is configured to be received by the top socket and the lower protrusion is configured to be received by the lower socket; 
                a casing deflector coupled to the mounting assembly, the casing deflector defining a chamber having an upper opening and a lower opening, wherein the casing deflector comprises an outer wall, the outer wall defining an inner deflecting surface extending between the upper opening and the lower opening; and 
                a hopper selectably attachable to the casing deflector, the hopper defining a casing storage chamber. 
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