这样改是不是不符合922R?只换了forearm,还有11个parts
27 CFR 478.39 - ASSEMBLY OF NON-SPORTING SHOTGUNS AND SEMIAUTOMATIC RIFLES FROM IMPORTED PARTS
(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. .......
(1) Receiver
(2) Barrels
[size=13.3333px](3) Barrel extensions
[size=13.3333px](4) Mounting blocks, trunnion
[size=13.3333px](5) Muzzle attachments
(6) Bolts[size=13.3333px]
(7) Bolt carriers
(8) Operating rods
[size=13.3333px](9) Gas pistons
(10) Trigger housings
(11) Triggers
(12) Hammers
[size=13.3333px](13) Sears
[size=13.3333px](14) Disconnectors
(15) Buttstock
[size=13.3333px](16) Pistol grips
(17) Forearms, handguards[size=13.3333px]
(18) Magazine bodies
(19) Followers
[size=13.3333px](20) Floorplates
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