You have the legal right to own an NFA item assuming you pass the following criteria:
- You must be a U.S. citizen over 21 years of age.
- You must live in a state that allows NFA items
- You must be clear of any felonies as verified by an F.B.I. background check.
- You must submit a fingerprint card and two passport photos, which are kept on file by the BATF.
- You must obtain a signature from your local Chief Law Enforcement Officer verifying that you have no felony indictments pending against you, and are mentally stable.
- You must pay a one-time federal tax for each NFA weapon or suppressor purchased. Full auto $200.00. Short Barreled Rife (SBR) $200.00. Suppressor $200.00. Any Other Weapon (AOW) $5.00.
I pretty much did a copy and paste from Vector's web site on all that above, but it is the same info any where you look.
The point to the registered bolt is that it was made and registered before the 1986 ban on the manufacture of MG's for private citizens. It really does not matter what gun you put it in for that matter, but if you change the host gun into a configuration fitting a MG, you must change it back if the bolt is removed (ie, a short barrel would have to go from the gun, if you sold the registered bolt, unless the host gun was an NFA SBR, or if the host gun is "Post-Ban" you cannot make it into what it classified as an "assault weapon", etc,...). Nonetheless, the main point is that the bolt itself is the registered machine gun part in and of itself. As far as bolt installation goes...it should be pretty much "drop in" if it is made as a "registered bolt". I do not know a great deal about the different varieties of bolts out there, so maybe someone else can chime in on that.