Hinz57 mentions the importance of the barrel crown. Our local gunsmith will immediately ck the crown—even on the finest firearms If there’s a problem of accuracy, he’ll recut the crown. Just to be sure. May not be as important with bbs due to the amount of clearance found in a daisy bore. But certainly a “burr” would cause problems.
Back to the Asian CO2 bb pistol using a “rubber” detent to position the chambered bb as a daisy uses a magnet or spring wire. I think this material also imparts a backspin allowing bbs to fly farther and straighter. They do it in the airsoft guns also.
It appears there is about .040” of interference in the bore, if a bb measures .174”. In this gun, they used, best I can tell, a piece of round solid tubing.
And the bb rests directly against it when chambered, otherwise the material might act as an obstruction.
These guns have heavy walled barrels allowing the rubber detent to be easily held into place. Of course the Daisy’s are thin tubing. Would be more difficult to place and hold
What we really need is someone to toolup and build us old men a “Daisy” like we want. I’d pay the $$$. Thx for listening.