BudsGunShop.com - case size

David, this is the Medium 40 inch Case and will fit the 26.1" KSG and the 38.5" 870DM or the 26.30" 870 Tac-14 DM.

Medium Dimensions: 14.25'' H x 2'' W x 36'' D.-Large Dimensions: 14.56'' H x 3'' W x 41'' D. If you check out this on Amazon you can see a picture thats better. It's currently offered there, sold by Bud's at a higher price. Guess that's why it's out of stock here. :)

This will fit your KSG, but probably not if you have the KSG-25, as it is nearly 40 inches long itself and this case is about the same length. If you have the shortened KSG it will work well. It was my pleasure to assist you.

David, I own 3 of these bags in the green color. Great bag. Very sturdy. Well made handle that velcros shut. Plenty of storage. Firearms velcro strap in very securely. Doubles as a shooting pad. Both firearms you mentioned will fit fine. And great price.