View Full Version : Shotgun pump variances?

March 29, 2007, 05:42 AM
Does any one out there have a referance on the variances in the pump assemblies of the Remington 870 and Mossberg 500/590 over time?

I have had trouble with a project that I have been working because of variances in the actions on older vs. newer guns. On the 500 it was the size of the action bars, while the 870 it seems to be the a long action tube:

The result has been at least one redesign and a month of delays.