Who uses it: Gunsmiths and rifle owners
What it means: Polishing the inside of a rifle barrel by coating a cartridge with lapping compound, a fine abrasive material. Lapping a rifle barrel changes its ballistic signature; it's one way to conceal evidence of firearm use. It only works on rifles; don't try it on a pistol.
How you can use it: When smoothing things out.
It's 350 miles from Gardiner to Worcester and back, but the trip was worth it -- because I shot two out of three targets with an AK-47 today, and was 3 for 5 with the civilian equivalent of an M-16. I hit three clay pigeons with a Beretta .391, hit a metal target with a Glock 9, and did really well on the target shooting range with a semi-automatic rifle. It was the most fun I've had in ages.
That said, I don't plan to buy a gun or get a license. I don't want or need a gun for personal protection -- I wouldn't ever use it to protect myself, and therefore it would just be a hazard to me. If I want to go back to a shooting range, I can use one of the range's guns.
This morning's Kennebec Journal reported that we have had two and a half hours of sunshine over the past ten days. Yet another reason it's a good thing I don't own a gun.