I think the great state of New York still has such a system in place for new handguns (fired case and projectile filed with the state). After 10 years and $10,000,000 to fund the program, judging its success has been difficult as they, to my knowledge, have yet to prosecute let alone convict any criminal using the gathered information as evidence. With New York not being so well off financially, we’re all hoping another 8 figure investment will yield at least one conviction to make it all worth while…
I’ll have to look into whether or not they allow the submission of a projectile fired with a discarded sabot!
Regarding the laws on AP in general, I’ll defer to the input from folks who have the tolerance for reading and trying to interpret such things. My understanding was that in general, manufacture and sale or importation and sale of all AP (as defined by BATFE) is prohibited unless for government agency use. Possession is OK. I wouldn’t doubt there is a lack of logic applied by the BATFE in their definitions. I try very hard to follow the state regulations that indicate AP is OK as long as you don’t do anything naughty with it. (That’s probably a good idea for most things anybody owns…)