All gun companies would be required to fire a shot through each barrel that they manufacture and submit it to a national database so that LE would have a database of all of the striations of all the barrels made. All ammunition manufacturers would submit a sample of each bullet manufactured to a similar database so that the LE would have a metallurgical match to all bullet lots manufactured as well. If all of this were in place, the LE would know with a simple search of national databases exactly which gun was used in the crime they are investigating.
This is the biggest misconception ever
I don't fault you for believing that which the Antis have pushed to get onto TV and in the news. Sure, striations have been used in a few cases, and was able to help the prosecution. But ballistics databases would be a giant waste of money with no results to prove they work, they are already used in two metropolitan cities, and NEITHER ONE, EVER has even HELPED in solving a crime.
A few excerpts from "Gun Facts v 5.1":
Fact: "Firearms that generate markings on cartridge casings can change with use and can also be readily altered by the users. They are not permanently defined like fingerprints or DNA."
Fact: "Automated computer matching systems do not provide conclusive results.”
Fact: The same gun will produce different markings on bullets and casings, and different
guns can produce similar markings. Additionally, the type of ammunition actually
used in a crime could differ from the type used when the gun was originally test-fired -- a difference that could lead to significant error in suggesting possible matches.
Fact: The rifle used in the Martin Luther King assassination was test fired 18 times
under court supervision, and the results showed that no two bullets were marked alike.
“Every test bullet was different because it was going over plating created by the previous bullet.”
Fact: "The common layman seems to believe that two bullets fired from the same
weapon are identical, down to the very last striation placed on them by the weapon. The
trained firearms examiner knows how far that is from reality."
Fact: The National Research Council deemed a national ballistics database as
impractical due to practical limitations of current technology for generating and
comparing images of ballistic markings
Fact: Maryland’s ballistics database “is not doing anything”111 and “has not met the
mission statement of the state police."112 In the first five years of implementation, it
failed to lead to any criminal arrest or convictions, despite collecting over 80,000
specimens at a cost of $2,567,633
Fact: More than 70% of armed career criminals get their guns from "off-the-street sales"
and "criminal acts" such as burglaries114, and 71% of these firearms are stolen.115
Tracing these firearms will not lead to the criminals, as the trail stops at the last legal
owner
Fact: Computer image matching of cartridges fails between 38-62% of the time,
depending on whether the cartridges are from the same or different manufacturers
Fact: Criminals currently remove serial numbers from stolen guns to hide their origin.
The same simple shop tools can change a ballistic profile within minutes. “The minor
alteration required less than 5 minutes of labor”.118 Criminals will make changing
ballistic profiles part of their standard procedures
Fact: “We in law enforcement know it will not, does not, cannot work. Then, no one
has considered the hundreds of millions of guns in the US that have never been registered or tested or printed.”125
Fact: “One, the barrel is one of the most easily changed parts of many guns and two, thebarrel, and the signature it leaves on a bullet, is constantly changing."126
All of these are excerpts from "Gun Facts, v5.1" pages 18 and 19, and can be read here:
http://www.gunfacts.info/pdfs/gun-facts/5.1/gun-facts-5.1-screen.pdf