The Rise Armament AR-15 Lower Parts Kit (brand part no. 12003) keeps your build moving with the 20 pieces needed to complete a lower receiver, deliberately sold without a fire control group so you can install your own trigger. Rise Armament has built a following among competitive and precision-minded AR shooters, and this kit reflects that same attention to detail in the small parts that too often get overlooked. It’s a straightforward way to finish out a lower build without hunting for pins and springs from multiple sources.

Key Specifications

• Includes 20 pieces to complete a standard AR-15 lower receiver build.
• Sold explicitly without a fire control group or trigger, letting you choose your own.
• Finished in black to match standard AR-15 hardware.
• Package length of approximately 7.05 inches.
• Shipping weight of approximately 0.2 pounds, consistent with a small-parts kit.
• Manufactured by Rise Armament, a brand known for AR-pattern trigger and small-parts kits.
• Designed to work with a wide range of aftermarket AR-15 fire control groups and grips.
• Rise Armament built this kit for shooters who want to pair it with their own choice of trigger.

Frequently Asked Questions

Does this kit include a trigger? No — it’s sold as a 20-piece kit minus the fire control group, so you can install your preferred trigger separately.

What color does this kit come in? Black, matching standard AR-15 finishes.

Buy the Rise Armament AR-15 Lower Parts Kit

Finish your AR-15 lower build with a kit from Rise Armament. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and see our complete AR lower parts kit selection.