i have emailed uncle mikes with no response as of yet. The tactical gun is not mine. I is a 12-ga pump (very old atleast 35 years old) barrel lenght is about 20" or so and i can shoot up to 3" shells. When you extend the pump out under there it says mossberg 500A?
it looks something like this
http://en.wikipedia.org/wiki/Mossberg_500

in regards to the caps for the sling at the end of the pump. I have one that screws into the magazine, kinda looks like a bolt, where most newer models have a cap that just screws out..this is the problem i have found in finding a sling for it..

any advice would be appreciated if you guys no of any web sites i can check that may have it...cabelas, basspro, and other major ones i have not found one on..
thanks