§ 478.39 Assembly of semiautomatic rifles or shotguns.
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a.(a) No person shall assemble a semiautomatic rifle or any shotgun using more than 10 of the imported parts listed in paragraph (c) of this section if the assembled firearm is prohibited from importation under section 925(d)(3) as not being particularly suitable for or readily adaptable to sporting purposes.
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b.(b) The provisions of this section shall not apply to:
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1.(1) The assembly of such rifle or shotgun for sale or distribution by a licensed manufacturer to the United States or any department or agency thereof or to any State or any department, agency, or political subdivision thereof; or
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c.(c) For purposes of this section, the term imported parts are:
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1.(1) Frames, receivers, receiver castings, forgings or stampings
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2.(2) Barrels
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3.(3) Barrel extensions
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4.(4) Mounting blocks (trunions)
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5.(5) Muzzle attachments
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6.(6) Bolts
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7.(7) Bolt carriers
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8.(8) Operating rods
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9.(9) Gas pistons
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10.(10) Trigger housings
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11.(11) Triggers
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12.(12) Hammers
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13.(13) Sears
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14.(14) Disconnectors
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15.(15) Buttstocks
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16.(16) Pistol grips
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17.(17) Forearms, handguards
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18.(18) Magazine bodies
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19.(19) Followers
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20.(20) Floorplates
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