Frie lapping is putting a grit on a bullet and shooting it through a barrel. The grit is made to degrade as it travels down the bore leaving the muzzle end slightly smaller than the chamber end. There are different grits that you use from course to fine. There are two different ways to get the grit that I know of one is made by Wheeler that you put your own grit on your bullets and the other one comes with the bullets already with the grit in them.
There is a lot said about fire lapping both pro and con. I even read about a gun guru that used it on his air gauged target barrel to prove that it didn't make fire lapped barrels shoot better. I would not recommend using it on a barrel that shoot good already. In my personal experiences it can usually make a rough barrel with tight spots shoot better. I use it as a last resort with guns that barrels are not up to par. I have used it on one barrel that was rough, it didn't shoot better but was a LOT easier to clean. It has done a good job for me on a Remlin barrel, a stainless 10-22 barrel and a Smith Victory barrel that shards of steel fell out of when I did an initial cleaning.
Here is the stuff i use for lapping a 22lr barrel, The Wheeler kit and a 22 60 grn Super Sniper round that is set in a 22 short case. It allows me to get a good amount of grit on a bullet.
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