@Franklink - accuracy question - is the 23" polygonal option a more accurate option than the carbine?
Yes and no....potentially.
Last I heard.....
17inch Ghost barrels (Carbine and Plus) are 12 land and groove rifled.
23inch Ghost barrels (HP) are polygonal rifled.
The 17 inch .177 barrel that came in the Ghost AOA sent me is as accurate as anything I've shot. In Oct of 2022 I used it to score a 47/48 in the Ghost's first field target match anywhere in the world (to my knowledge). There was hardly any wind that day.
I also used it to shoot a match in November of 2022. It scored a 39/48, 4th place out of 9 shooters in Hunter that day. Match high was a 42/48. That was one of my worst showings at a <55yard ft match in 4+ years. It was very windy that day.
Anecdotally, I've seen that sub 20 pellets fired from a polygonal rifled barrel are not "taken for a ride" in the wind as much as sub20 pellets fired from a 12 land and groove rifled barrel. Both can be equally accurate, but the poly-fired pellets need less hold-off to account for wind, making it easier to drop targets in the wind.
There's a relevant saying here, "aggregation of marginal gains." Popularized by Dave Brailsford (Google it), basically, lots of small things accumulate to make a big difference. It seems that we can really see this in equipment heavy competitions, like cycling for Brailsford, or field target for us. Essentially, lots of small things make the difference in winning and losing. And I personally, based on testing a decent # of barrels, have found a polygonal rifled barrel is a small leg up.
So, the shorter .177 barrel on a Ghost isn't less accurate than a 23inch .177 Ghost barrel, but the longer barrel won't need as much hold-off in winds. This has nothing to do with the length, and everything to do with the rifling.
Granted, somebody really gets to know a 12 land and groove rifled barrel, and especially how it behaves in the wind, and they'll still beat a polygonal barrel used by a guy who doesn't put in the time to learn it.