I didn't even know there was such a thing as a choked .22 rifle barrel made by anyone, anywhere.
Seeing as it's an added step in manufacturing and thus an added expense... Anyways...I have a bbl for my Competitor pistol that's a 22lr/5mm. Chambered to fit the 22lr cartridge yet the bore chokes down to 5mm.
The man behind this one had a LOT of experience in designing both firearms as well as cartridges so who was I to doubt him. It does give outstanding performance so guess I can't doubt it.