This was posted a couple of months ago by another member:
"This refers to your letter of March 19, 2001, in which you ask about the status of certain semiautomatic assault weapons which have been altered to another configuration.
As defined in section 921(a)(30), of Title 18, United States Code (U.S.C:), the term "semiautomatic assaultic weapon" includes certain named weapons and certain semiautomatic rifles, pistols, and shotguns that have a combination of enumerated features. Title 18 U.S.C. section 922(v)(1) prohibits manufacture, transfer, and possession of semiautomatic assault weapons; however, section 922(v)(2) provides that any semiautomatic assault weapon that was lawfully possessed under Federal law on September 13, 1994, is excluded from the prohibition.
A frame or receiver of a semiautomatic assault weapon, meets the definition of a "firearm" in 18 U.S.C. section 921(a)(3); however, a firearm frame or receiver alone, without the additional qualifying features, does not meet the definition of a "semiautomatic assault weapon" in section 921(a)(30). Therefore, a firearm frame or receiver does not meet the exemption in section 922(v)(2).
We have also determined that a semiautomatic assault weapon in knockdown (unassembled) condition consisting of a receiver and all parts needed to assemble a complete semiautomatic assault weapon are subject to regulation if the parts are segregated or packaged together and held by a person as the parts for the assembly of a particular firearm.
You describe an AR15 type rifle that met the definition of a semiautomatic assault weapon and was lawfully possessed on September 13, 1994. At some subsequent time the rifle was temporarily reassembled in a configuration such that it no longer had the qualifying features of a semiautomatic assault weapon. You asked if the original components could then be lawfully reinstalled on the rifle.
Provided that the original components were held by the owner and reinstalled on the rifle, it is our opinion that the rifle would still qualify as an exempted semiautomatic assault weapon even though it had been temporarily assembled in a different configuration. We note, that mere disassembly of a semiautomatic weapon by an owner would not remove the firearm from the definition of a semiautomatic assault weapon nor would the reassembly constitute manufacture of a prohibited semiautomatic
assault weapon.
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