The lap kit is $18.50 plus $4 shipping to any US address.
To prepare 22 rimfire lap bullets, choose the slowest ammo you can find with 40 gr or heavier bullets. CCI pistol match is great, and their standard velocity is real good.
Wipe a tiny amount of abrasive into the grooves on the bullet, then wipe it ALL OFF with a forward motion, using a paper towel. YOu can load this in clips or magazine and fire it.
When I fire lap a rimfire I like to shoot 5 shot groups, at 25 yards if a handgun, 50 yards if a rifle. I prefer shooting at a steel plate. When the 5 shot groups quit getting smaller you are done lapping. 15 shots, or three groups takes care of many guns, but shoot till the groups quit shrinking. I haven't seen, tried or heard of a gun yet that wasn't improved by cutting groups at least in half.
My best two were a Ruger 10 22, which shot almost any ammo into 2 inches or larger before lapping. It would cut a grass stalk every time at 50 yards after lapping. I hope the guy who stole it has a misshap that puts one of it's bullets precisely through one of his vital organs.
The other was a Colt huntsman which I had owned for 30 years before I lapped it. It shot any ammo, cheap or expensive, into 1 1/4 inches at 25 yards, for all those years. I used to shoot a brick of ammo a week through it, but all those thousands of rounds didn't help smooth the bore. The day I lapped it, I clamped a scope on so I could get some precision. Groups were the same as with iron sights. I've forgotten now, but I believe my third group on a steel plate, didn't increase in size with the five shots. I switched to a 10 shot clip of clean ammo and printed a half inch dot on the plate. I could not see any growth in the dot size after the first shot.
I've had hundreds of reports equally exciting from customers. All good, Never a bad one in all the years I've been selling the lap kit. Remember when you order. One kit will do about a hundred blued 22 rimfire guns. Ruger stainless is the only hard ones to lap, but treat them the same. Shoot till groups quit shrinking. Then switch to clean ammo. No need to clean the gun up after if you wipe the lap ammo clean as discribed above.