The Wilson Combat AR-15 Lower Parts Kit (brand part no. TR-LOWERK) covers the small parts most AR-15 builds need to finish a lower receiver, built by USGI contractors to meet or exceed military specifications. It’s the same kit Wilson Combat uses on its own custom AR-15 builds, and it includes a right-hand semi-auto safety selector ready to install. This kit is AR-15 only and does not include fire control parts (hammer, trigger, disconnector, or springs), so it’s built to pair with a separate trigger group of your choice rather than lock you into one option.

Key Specifications

• Built by USGI contractors to meet or exceed military specifications.
• Includes a complete bolt catch assembly — bolt catch, plunger, roll pin, and spring.
• Includes a complete magazine catch assembly — catch, spring, and button.
• Includes a pivot pin, takedown pin, 2 pivot/takedown detents, and 2 detent springs.
• Includes a safety detent and spring for the safety selector.
• Ships with a right-hand semi-auto safety selector ready to install.
• Includes an aluminum GI trigger guard with roll pin.
• Includes 2 trigger/hammer pins for fire control installation.
• Does not include fire control parts — hammer, trigger, disconnector, or springs are sold separately.
• Compatible with AR-15 lowers only, not AR-10 pattern receivers.

Frequently Asked Questions

Does this kit include a trigger group? No, fire control parts (hammer, trigger, disconnector, springs) are not included.

Does it include a safety selector? Yes, a right-hand semi-auto safety selector is included.

Will this fit an AR-10? No, this kit is built for AR-15 lowers only.

Buy the Wilson Combat AR-15 Lower Parts Kit

Finish your AR-15 lower with the same small-parts kit Wilson Combat uses on its own custom builds. Order it from our Wilson Combat lineup in our AR lower parts kits selection. Ships fast from a Lubbock, TX gun shop.