I have many various double shotgun parts available. Here is a short list of some of the makes that I have parts for.
Parker Hammerless, Parker Hammer (Top action and Lifter), A. H. Fox, Ithaca Flues, Ithaca Lewis, Lefever Nitro Special, Lefever Arms Co. (Syracuse), Stevens 311, Iver Johnson, NR Davis, LC Smith Hammerless, LC Smith Hammer, Winchester 24, Mauser Bolt Action Rifles.
All of my active Gunbroker listings of items for sale can be seen by clicking here.
Contact me if you are looking for any specific. I have many parts that are not currently listed on Gunbroker.