I'm trying to get a 7+1 capacity out of my 870 with an 18" barrel. I've used a Scattergun extension and the GARBAGE factory extension, both of which only give you a 6+1 capacity. Here's what I figure . . . The factory extension is even with the muzzle at 6 3/4" long. It only actually has about 4 1/2" of usable space because of the ring that cut into it where the clamp sits. Even with that in mind, I can still get a 7th shell about half way in the tube. With another inch, I could get that 7th shell in there. I'm going to try the Choate extension next. Either way, I need to replace the factory extension because it's **** but if the Choate lets me get 7 in the tube, I'd be delighted. Does anyone have any input on this?
You can see there's room at the end for the spring and follower.
You can see there's room at the end for the spring and follower.