Firstly, shooting MOA at 100yds with the .22LR is not easy. Contrary to the opinion of folks who have never done it but nonetheless have an opinion, it's more difficult than shooting MOA at 50yds and requires more rifle to do it. Typically, a half-MOA at 50yd rifle will be a 3/4-1MOA rifle at 100yds. You need a really good rifle, with a really good barrel, good optics with solid mounts, a really good trigger, and a really good bench technique, shooting really good ammo. I would say that shooting MOA at 100yds with a .22LR would be equivalent to shooting half-MOA with a centerfire.
If you want anything close to MOA@100yds, forget the factory heavy barrel models. Ruger actually does produce a very good barrel. It's the chambers that are found lacking. Great improvements can be seen by simply setting them back, rechambering them and recutting the crown. Problem is, by the time you spend the extra coin for one and then pay to have the work done, you could've bought a new barrel that's better all the way around. If you just want a heavy barrel, buy the cheapest you can find. If you want one that will shoot well, buy a Green Mountain. If you want accuracy, buy a Clark, Shilen, KIDD or Lilja and expect to pay $175-$400 for it. This is one case where you truly get what you pay for.
Clark is VERY well reputed. They started the whole heavy barrel 10/22 game. Their guns are really a good value but fortunately, unlike 99% of the guns out there, this is one you can build yourself. You can really build a better rifle yourself for $800. Here is one I built with a Nodak receiver ($130). It is all CNC machined, wears a hard anodized finish and uses beefier 8x40 screws to attach Marlin 336 pattern scope bases and also their proprietary rear peep sight. It also has a Rimfire Tech accurized bolt ($80) with a Superior Concepts charging handle ($40). I utilized one of Clark's excellent 21.5" midweight barrels ($200). These are cut from the same Lothar Walther blanks as Tony Kidd's barrels. I also used a KID 14oz trigger ($300) and Boyd's Tacticool stock ($80). Not counting sights, scope and mount, that's $830 for a rifle with the best trigger you can buy for the platform, an accurized bolt and a better receiver. It shoots 3/4-1MOA at 100yds with Wolf MT.