Would that increase the cost? Are they going to be regular chamber or a match/target? Because I like to have a short barrel, but I don't want to lose the reliability with bulk ammo. Because that what the gun is really meant, plink and such, not target. So I don't see the point of a LW barrel.
You cannot thread the standard barrel, due to the barrel diameter. So be obvious that it's not just a shorten factory barrel.
Yes on all accounts. We are not engraving the barrel because the barrel length alone does not constitute whether the rifle is R or N/R. OAL is the key. If you fear the po-po then I would print off the legal definition of a N/R rimfire rifle and keep yourself a tape measure handy. Easy peasy.
Your average policeman is not a firearms expert so this would be a pro-active way to minimize any potential headaches.
As for the chambering, we will make them with our standard 'Sporter' chamber which feeds 99% of the .22 on the market. This is definitely not a target type rifle, lol. She's a beer can hunter.