PJ Holster offers several miscellaneous products:
Shot Shell Carriers allow you to carry two extra shells for your Bond Arms Derringers. Extremely small and easy to carry.
Dual Mag Cover Plate - covers and joins two or more single mag carriers allowing for dual or single mag carry. OWB only. Comes with Self stick Velcro to attach to the outside of the magazine and the back plate. This is a great option giving added versatility.