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Progress The lower: The UBAR diy AR-15 lower receiver by Ivanthetroll, the 3D printed AR-15 waffle magazine. The upper: KCAD prototype 3D printed bolt action AR-15 upper receiver system, KCAD prototype 3D printed free-float AR-15 handguard, and an experimental 3D printed flash hider. 300 AAC Blackout barrel with a standard bolt.

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