There's easy paths forward. Some manufacturers make custom molds. We have options for superlative .20 barrels.So why not make a slug-shooter .20? This has been on my radar a long time, and my Leshiy has easily-available .20 barrels and the easiest caliber swap in PCP airgunning.
So what if they just started making consistently accurate barrels with clean rifling and even crowns? In .177 and .22 at least? Can we pass that info along to them?
Yes this is an old thread. However, I would very much would love a cheaper option then the Walther .20cal barrels. Especially now that Crosman introduced the 362, I don't understand why they just don't market the .20cal. If they took a Bob Beeman approach to marketing the 5mm (maybe) they would re-energize the caliber? I would take any day a .20cal over .22 and definitely over .177. Just a perfect caliber and if heavily marketed so pellet manufacturers produced a wide range of size/shapes/weights that would be the only caliber I would buy, especially for mid-powered AGs. So a long story short: a big yes for .20cal barrels...
Airforce offers the Talon and Condor in .20...https://www.airforceairguns.com/AirForce-Airguns-Talon-Air-Rifle-p/u20042.htmhttps://www.airforceairguns.com/AirForce-Airguns-Condor-Air-Rifle-p/u20432.htm