These choke tubes
(http://i1228.photobucket.com/albums/ee446/trkyhntr56/chokes2.jpg)
One on the left is a Tru Glo ported tube for a Mossberg 500, never had a shell through it, not sure what the constriction is I think it's a 670
One on right is anSSX 670 choke tube for an 835 Mossberg
Will trade both for a Mossberg 20ga 570 IC or PG choke tube
Or take 50.00 for the pair
whats the constriction on the ssx choke? is it the one thats on allaboutshootin.com???