I subscribe to Blue Book of Gun Values, but I find their pricing to be out of touch w/ the market on many pieces.

With that said, why support them?

 

Many potential buyers treat it like the Bible. I use it as a benchmark - for some pieces, it's fairly close.

 

There are a couple on Gunbroker (search-completed listings) that did not sell in the $525 range. A couple sold in the $500 range
I think your additional 6" barrel and slide would be worth about $375 +/-, in fact someone on the Forum was looking for one recently. You don't see these very often anymore.
Nice package, I'd be happy to own that.

 

With all of the price hikes after 2019.. It seems that these colts are stuck at the 500 range.. I bought a NIB target model 4 years ago for 450.. The spare barrel adds a good amount..

 

I finally sold my unfired 6 inch some years ago... maybe 3?

I found an interesting gulf in interest where this gun is concerned after having it at upwards of 10 shows. Seems serious .22 semi auto shooters want most any one of several other pistols more while many won't even consider this one. Plinkers didn't want it for lack of upgrades and magazines and revolver types wouldn't even slow down. "Colt Collectors" cared not a whit!

I eventually scored a few extra mags and decided it'd be the rented-mule of my .22s for guests and such. Once I decided to not apply the "N.I.B. Colt" attitude to it, it fairly flew off the table at $650. Of course, those extra mags helped considerably too.

As far as yours having an entirely extra slide and barrel.... those alone have to be $150 or more, I should think.

 

Did you find a value for the slide kit? I have been looking for one.

 

I haven’t seen a 6” barrel and slide conversion for a few years. Hard to find and may be cheaper to buy the complete 6” pistol.