+1!
Even if Dave Tubbs sells this kit, I can't imagine ever fire lapping any barrel. If a factory rimfire barrel is so rough that it needs to be lapped, it probably needs to be replaced.
Whenever someone brings me a .22 LR rifle that won't shoot, I check the base and ring screws. Then I run a patch with Hoppe's #9 through the bore, if for no other reason than to establish a baseline performance level. Then I shoot a variety of ammo, usually starting with RWS Target Rifle or Rifle Match. On Ruger 10/22s, I always check to make sure that the barrel attachment is tight.
Jeff
