Some "parts" have multiple parts in them, leading what looks to be 4 parts legally be 10 parts. This is a complicated issue. Conversion is not something that is as easy as some of you are suggesting it is. It ain't rocket science, but its not something to mess with unless you do your homework and not listen to the legal advice of a couple of people on a forum. There are threads on FTF about this topic exclusively.
.45acp, .40 S&W, 9mm, .38 Spl, .380 acp, 22lr
12 gauge, .223/5.56x45mm, 30-30 Winchester
2 Chron. 7:14 Christians must seek His face