I owned a 23, and was good with it.
Always worked perfectly.
I just wanted to trim my calibers down to 9mm (and a little 45)
I have 2 19s (one is a suppressor host) and a 21 SF by the bedside.
None are really collectible in my opinion, just tools like others have said.
:)
My M85 9mm conversion SBR is still pretty fun...and more so suppressed.
I just ordered a KP-9 and it will probably take a place there.
:)
https://youtu.be/hkjOdVJa9e8
UPDATE:
My neighbor was able to weld the carrier and we replaced the firing pin whigh had broken for some reason.
I test fired yesterday and it's GTG.
On a side note, the original builder did reply within a couple of days and offered "to repair or replace any modded parts to get me running...