Complete Your AR-15 Lower the Right Way
Whether you’re finishing your first rifle or dialing in your next custom build, the Smith Defense AR-15 Lower Build Bundle gives you everything you need to get it done right. This all-in-one package includes the Lower Parts Kit, Buffer Tube Kit, and Mil-Spec Stock—three essential components designed to work together flawlessly.
Each part is built to true mil-spec dimensions for reliable fit and performance. With high-quality materials, precision machining, and Smith Defense’s proven attention to detail, this bundle eliminates the hassle of mismatched components or loose-fitting parts.
Why Builders Choose This Bundle
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Everything you need in one package – no more chasing down compatible lower parts from multiple brands.
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True mil-spec fit and function – consistent dimensions ensure a secure, solid build every time.
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Built to last – corrosion-resistant hardware and impact-resistant polymer stock for long-term durability.
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Easy installation – includes all the small parts, pins, and springs needed for your lower receiver assembly.
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Proven performance – engineered for smooth operation and dependable use, round after round.
What’s Included
Smith Defense AR-15 Lower Parts Kit
Mil-Spec fire-control group with polished and ground sear surfaces, Mil-Spec pin kit, Mil-Spec A2-style pistol grip (for lower build kit), Mil-Spec bolt catch, Mil-Spec trigger guard, Mil-Spec magazine catch, Mil-Spec buffer-retainer kit, and Mil-Spec selector kit.
Smith Defense Buffer Tube Kit
Mil-spec 7075-T6 aluminum 6-position carbine buffer tube, 3oz buffer, steel castle nut, steel end plate, buffer retainer, and buffer spring.
Mil-Spec Stock
Durable polymer construction with a snug, reliable fit and adjustable length of pull.
Build With Confidence
Whether you’re finishing a fresh 80% lower or replacing worn-out components, this Smith Defense bundle from 5D Tactical delivers the mil-spec quality and reliability serious builders expect—without the guesswork.
