Thingiverse
MakerWorld
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Printables
Thangs
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CGTrader
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Folding Stock 3D Printable Models
Carbon Tube Brace
MakerWorld
WrenchWorks3D
Brace Hinge
MakerWorld
WrenchWorks3D
Stock 1913 Picatinny Rail Adapter for JMAC Customs/Atlas Customs/5KU/ZION Arms and Similar
Thingiverse
NebulousShade