The Specter Gear 6 Shell Buttstock Shotshell Holders are discontinued by the manufacturer. I would recommend the Vism Shotgun Stock Shell Pouch, found by using the link below:
https://www.opticsplanet.com/vism-shotgun-stock-shell-pouch.html
Yes, it would be compatible.
No, this would not fir the DP-12.
Yes, the Mossberg model would fit the 930.
I would probably recommend going with the Benelli option as its the only semi-auto listed and the rest of the shotguns are all pumps. You may need to do some trial and error as none of them are listed specifically for a 1301, but they should all be fairly universal/adaptable.
I would probably recommend going with the Benelli option as its the only semi-auto listed and the rest of the shotguns are all pumps. You may need to do some trial and error as none of them are listed specifically for a 1301, but they should all be fairly universal/adaptable.
This is technically meant for a standard synthetic stock, but it should still work on the Magpul SGA stock.