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If you have a 6-1/2" forend that also has integrated action slide bars (ones before 2006 were not integrated), you may order the 7-5/8" Action Slide Tube Assembly (with two action slide bars) from Havlin sales, or from Bob's Gun Shop, or from Numrich, #53170A, .90 an Action Slide Tube Nut (Forend Nut) from Havlin Sales, or from Bob's Gun Shop, or from Brownells SKU #:631-000-169, .69, back ordered You may save money if you can locate any 7-5/8" forend WITH an included action slide tube assembly AND an action slide tube nut (forend nut) just for the two parts that you need.
It was still there when I sold it (Wish I still had it).
don't see much of a rim though could be an old battery casing? All brass shotshells started being manufactured in the USA in the mid 1870's.
Their popularity waned when the paper shells became more popular.
You have the new integrated action slide bar forend if you do not see a forend nut with two slots at the forward end of the forend (closest to the takedown screw).
If you do see a forend nut, after disassembly you can use the back of a butter knive blade, etc.You could always take it off and measure the length. I think that you are either looking at the identical Pro Mag Tri-Rail Forend on Ebay, .95 or the preferable combination Pro Mag, , PM168 - Mossberg 500/590 (12 Gauge) Tri-Rail Forend and .