I have no idea if a Remington extension will fit your gun, but if it does ANY extension made for a Remington 870 will fit.
Remington hasn't changed the threads on the 870/1100 series guns since they were introduced in 1950.
A good method of telling if an extension made for a 870 will do, is to borrow a Remington magazine cap and see if it will screw onto your gun.
Most gun shops will allow you to try one of their caps on your gun.
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