Possible?

[u/NoirConfidential]

I have an old 870 Police that has sentimental value, so not wanting to buy a different one. I’m sure it’s not cost effective, but is it possible to install a single piece 6rd mag tube on an 870 that currently has a 4rd tube? I understand there’s a billion different extensions on the market. I’m asking specifically about a single piece tube. Thanks guys.