Complete Your AR-15 Build
Whether you’re finishing your first AR or building your tenth, the Smith Defense AR-15 Lower Build Bundle makes it easy to get it right the first time. We’ve combined three essential components — the Lower Parts Kit, Buffer Tube Kit, and Mil-Spec Stock — into one convenient package that saves you time, money, and guesswork.
Every part is built to true mil-spec dimensions and backed by Smith Defense’s reputation for quality and reliability. You’ll get smooth fitment, solid performance, and a setup that just works — no frustrating mismatched parts or wobbly stocks.
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All the essentials in one kit — no more piecing together lower parts from different brands.
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Mil-spec fit & feel — built to standard AR-15 dimensions for rock-solid compatibility.
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Durable & dependable — corrosion-resistant hardware and impact-resistant polymer stock.
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Easy install — all the small parts, pins, and springs you need for your lower receiver.
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Proven reliability — designed to handle thousands of rounds and years of use.
What’s included
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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, Mil-Spec selector kit.
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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.
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Mil-Spec Stock — durable polymer, snug fit, and adjustable length-of-pull.
