Barrett Firearms Barrett MRAD Large to Small Breech Conversion Kit. Some earlier models of MRAD rifles were not able to use caliber conversion with out converting to small breech. Specifications for Barrett MRAD Large to Small Breech Conversion Kit 222F39F0: Manufacturer: Barrett Magazine Capacity: 0 Round Magazine Included: No Package Contents: Barrett MRAD Large to Small Breech Conversion Kit The Barrett MRAD Breech conversion kit allows you to convert your MRAD rifle from large breech to small breech. Some earlier models of MRAD rifles were not able to use caliber conversion with out converting to small breech. 14674-1