I just picked up a used Mossburg mdl 185D-A bolt action shotgun. It came with what I believe is a full choke screw on choke. I am just wondering what other brands might fit this so that I can pick some up easily. I am just hoping that somebody here might know.

Choke tubes that fit Winchester or Browning Invector also fit Mossberg. My buddy has borrowed my Browning turkey tube for his Mossberg many times.

Isn't thatan external chokewith threads on the outside of the barrel?
And some of those models came with an externally attachedPolychoke.
If it's external, then you need to find a factory Mossberg replacement.
If it's aninternal choke, you can send thechoke into this outfit tohave it matched up just in case it's an aftermarket installation.You can also call them for advice:

http://www.carlsonschokes.com/

Yeah, its external choke. I was hoping that there might be another gun or two that used the same type of choke. Oh well, it shoots pretty good with what is on it.