I don't worry too much about the capacity on the 870. Its an ole workhorse farm/ranch gun for dispatching snakes and possums around the hen house, and pointing drunken college/high school kids who stray on the property, kicking their heels up a little too high to the most direct route back to the road.
For SHTF, I have the Saiga/ drums.
The dimples are no big deal there are some utube videos that show what a snap it is to swap them out...
Best to wait till the Gov figures out what they are doing with all the crazy stuff first!
God so loved the world He gave his only Son...
...Believe in Him and have everlasting life.