Stoeger M3000 Magazine Extension

[Stockwellbell]

 

I have a Stoeger M3000 with a 18.5 " barrel.

What manufacture and length extension will make the extension and barrel the same length?

The model I have is a 31891.  I am wanting to have the same look  as the freedom series model 31891 FS This. model comes with an extension already installed and a sling bracket on the barrel nut from the manufacturer.

I am wanting to have the sling attachment connect at the barrel nut. Not on a bracket connecting the barrel and extension.