I've had Briley choke tubes installed in two 20 gauge M-23's.
On the 25 1/2 " Lwt, Briley called and said the walls were pretty thin, but they thought they could do it. they did and I hunted with that gun for years.
the 28" gun was done with no trouble.
If you are only going to use this gun for targets, I would just get the chokes opened up, however, and save the $.
I do not think either installing Briley tubes or opening up the existing chokes will make much dfference on resale. What will make a difference is the first shot thru an unfired gun.
I have since sold both of these M-23's for a fair price.
