The other option is to buy a single shot[easiest]rifle in a .22centerfire cartrige,and get inserts from the guy in Ak for 20.00.May not be as accurate,but it will work.Bore dia is same for .22mag,222,223,but .22lr is .223;[heeled bullet bumps up,just not match].
If MONEY is no object,buy a Ruger single six w/.22/.22mag cylinders,have a 16in barrel installed with a Rifle stock like the old cap-n-ball remington.Should'nt be a violation to have 16in+ barrel with rifle stock,since it would be a registered handgun under federal law;just keep all parts to return to handgun,and never install pistol grip to 16in barrel.Option 2 have a 15 in barrel installed on single six as handgun,w/scope; still handgun.It's legal to brace handgun with unattached walking stick etc.