In reply to:

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TITLE 27--ALCOHOL, TOBACCO PRODUCTS AND FIREARMS

CHAPTER II--BUREAU OF ALCOHOL, TOBACCO, FIREARMS, AND EXPLOSIVES,
DEPARTMENT OF JUSTICE

PART 478--COMMERCE IN FIREARMS AND AMMUNITION--Table of Contents

Subpart B--Definitions

Sec. 478.11 Meaning of terms....

Destructive device. (a) Any explosive, incendiary, or poison gas (1) bomb, (2) grenade, (3) rocket having a propellant charge of more than 4 ounces, (4) missile having an explosive or incendiary charge of more than one-quarter ounce, (5) mine, or (6) device similar to any of the
devices described in the preceding paragraphs of this definition; (b)
any type of weapon (other than a shotgun or a shotgun shell which the
Director finds is generally recognized as particularly suitable for
sporting purposes) by whatever name known which will, or which may be
readily converted to, expel a projectile by the action of an explosive
or other propellant, and which has any barrel with a bore of more than
one-half inch in diameter; and (c) any combination of parts either
designed or intended for use in converting any device into any
destructive device described in paragraph (a) or (b) of this section and
from which a destructive device may be readily assembled. The term shall
not include any device which is neither designed nor redesigned for use
as a weapon; any device, although originally designed for use as a
weapon, which is redesigned for use as a signalling, pyrotechnic, line
throwing, safety, or similar device; surplus ordnance sold, loaned, or
given by the Secretary of the Army pursuant to the provisions of section
4684(2), 4685, or 4686 of title 10, United States Code; or any other
device which the Director finds is not likely to be used as a weapon, is
an antique, or is a rifle which the owner intends to use solely for
sporting, recreational, or cultural purposes.

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