Dave
It is running anywere from 6 to 10 weeks to get a barrel fitted and returned , but for the price that it will cost to do this you may be better off just buying a new 22LR Sportster , they run anywere from $100 to $120 depending on were you get them .
Your looking at about $85 just for the barrel , fitting and return shipping , plus another $15 or so to ship the rifle to H&R , so you are at about $100 there .
JMHO
stimpy