Part III
B. Definition of “Frame or Receiver”
The Department proposed to revise the definition of “frame or receiver” with a multi-part definition. First proposed was a general definition of “frame or receiver” with nonexclusive examples that illustrated the definition. This was followed by four proposed supplements, described below, that further explained the meaning of the term “frame or receiver” for certain firearm designs and configurations. Although the proposed definition was intended to more broadly define the term “frame or receiver” than the current definition, it was not intended to alter any prior determinations by ATF regarding which specific part of a given weapon it considered the frame or receiver. The NPRM also proposed to codify in the regulations the factors ATF considers when classifying the frame or receiver of a firearm.
1. General Definition of “Frame or Receiver”
As a threshold matter, the NPRM proposed that the new definition, with a partial exception for an internal frame or chassis, make clear that each frame or receiver be visible to the exterior when the complete weapon is assembled so that licensees and law enforcement can quickly and easily identify the markings. Next, the NPRM proposed defining the term “frame or receiver” more broadly as a part that provides housing or a structure designed to hold or integrate any fire control component, which would have included, at a minimum, any housing or holding structure for a hammer, bolt, bolt carrier, breechblock, cylinder, trigger mechanism, firing pin, striker, or slide rails. However, the proposed definition would not have been limited to those particular fire control components [45]
and was proposed to be general enough to encompass changes in technology and parts terminology. For further clarity, four nonexclusive examples with illustrations of common single-framed firearms were provided.
See
86 FR at 27727, 27742. Finally, the proposed definition stated that persons who may acquire or possess a part now defined as a frame or receiver that is identified with a serial number must presume, absent an official determination by ATF or other reliable evidence to the contrary, that the part is a firearm frame or receiver without further guidance.