[brbethke]

If it's an AR-15 type rifle, it's very easy to swap barrels. If it's some other type, it's slightly more difficult, but nothing beyond the capability of any average 19th-century blacksmith or garage-shop tinkerer.

"Ballistic fingerprinting" guns is a stalking horse: to make it work you'd have to make it illegal to modify a gun once fingerprinted, which basically means wiping out the entire aftermarket parts and repair business. If you can't repair grandpa's old Springfield -- well, that's one less unregistered gun on the loose, isn't it?

[6ppc]

"Ballistic fingerprinting" guns is a stalking horse: to make it work you'd have to make it illegal to modify a gun once fingerprinted, which basically means wiping out the entire aftermarket parts and repair business.

Also wiping out serious target shooting as a sport. I shoot benchrest and go through two new barrels each year. Most BR shooters consider a barrel to be shot out between 1500 and 2000 rounds.