Not being a wize-adze here, just wondering why?
As easy as the 455 is to disassemble and the minimal cleaning needed for a 22,
what use is a bore guide? Seriously, we're not discussing a threaded barrel
or pressed barrel/action centerfire, it's a 22. Only cleaning I do is to pull a couple
of dry patches through the bore after a morning at the range. If I find a carbon ring
has formed, I only use a brush to clear the chamber, not the entire bore. Lack of
rod/jag/brush use has not affected accuracy out of my three 455 22lr barrels,
1 Varmint, 1 American, 1 Lilja. Sure is easy to pull the 455 apart for inspection
and the few times I've needed to clean the bolt face. I don't see the need for a bore guide.
Using sub-sonic lubed ammo there isn't a whole lot of fouling to deal with.
Again, why a bore guide for a 22lr that comes apart with a minimum of effort?