Remington model 12 action bar

[kythera]

I am trying to replace the action bar onto the magazine tube on a model 12 Remington pump. Is the tube threaded onto the action bar?

[Loader9]

Might save this to a picture file and enlarge it. I can't tell by looking at one I have and haven't had it apart.
http://www.okiegunsmithshop.com/RemModel_12.jpg