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A Bill of Materials (BOM) for a PY2A AR-9 (PrintYour2A) lower receiver typically includes the printed frame, specialized reinforcement rails, and standard AR-15 lower parts.

Core PY2A AR-9 Components

• Printed Receiver: PY2A AR-9mm V2 lower receiver printed in PLA+ or Nylon.
• Reinforcement Rails: PY2A laser-cut steel front and rear reinforcements (commonly used to improve durability).
• Mounting Hardware: Bolts/screws included with the reinforcement rails. 

Required Lower Parts Kit (LPK) 

A standard mil-spec AR-15 Lower Parts Kit is used to complete the build. This includes: 

• Trigger and Hammer
• Trigger Guard
• Selector
• Bolt Catch
• Magazine Release
• Takedown/Pivot Pins
• Buffer Retainer
• Springs and Detents

Recommended Assembly Items

• Buffer Tube Assembly: Carbine-length buffer tube, buffer, and spring.
• Stock or Brace: Adjustable stock or stabilizer brace.
• Pistol Grip: Standard AR-15 grip.