Rise Armament 12003 AR-15 Lower Parts Kit

Rise Armament AR-15 Lower Parts Kit

The Rise Armament 12003 Lower Parts Kit provides everything you need to assemble a complete AR-15 lower receiver—minus the trigger and grip. This 20-piece kit delivers quality components manufactured to mil-spec standards, making it an excellent choice for builders seeking reliable, durable parts.

Materials and Construction

Most components in this kit are forged from 8620 steel, a nickel-chromium-molybdenum alloy prized for its toughness and machinability. The Safety Detent Pin and Takedown/Pivot Pin Detents are manufactured from yellow zinc for additional durability. All steel parts receive a black phosphate finish that deposits an inert protective layer, preventing corrosion and extending service life through extended shooting.

What's Included

• Takedown and Pivot Pin Detents (2)
• Bolt Catch assembly with spring and plunger
• Bolt Catch Roll Pin
• Buffer Retention Pin
• Trigger Pins (2)
• Safety Selector with detent pin and spring
• Magazine Catch assembly with button and spring
• Receiver Takedown and Pivot Pins
• Springs for Takedown/Pivot Detents (2)
• Spring for Buffer Retainer

Why Choose This Kit

Rise Armament's commitment to precision manufacturing and quality materials ensures these parts will withstand the wear and tear of continuous shooting. The black phosphate finish provides proven corrosion protection, while the 8620 steel components deliver the strength and reliability serious shooters demand. Whether you're building your first lower or replacing worn components, this kit offers the quality foundation your AR-15 deserves.