AR‑15 Lower Parts Kit (LPK)
Everything you need to assemble your AR‑15 lower receiver, packaged in convenient color‑coded packets to simplify installation. Pair this kit with a buttstock or brace kit to complete your lower group.
Overview
This lower parts kit contains all common small parts and springs needed to build a functional AR‑15 lower. Ideal for first‑time builders and experienced hobbyists alike — the color‑coded packaging speeds parts identification during assembly and helps prevent lost springs and pins.
Includes
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Bolt catch assembly
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Bolt catch & roll pin
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Bolt catch plunger & spring
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Trigger group
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Trigger
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Trigger spring
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Disconnector
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Disconnector spring
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Hammer
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Hammer spring
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Trigger/hammer retaining pins
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Safety & controls
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Safety selector (ambidextrous options vary by SKU)
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Safety detent & spring
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Magazine catch, spring & release button
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Pins & detents
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Pivot & takedown pins
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Pivot/takedown detents & springs
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Grip & buffer
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A2‑style pistol grip, grip screw & washer
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Buffer retainer & spring
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Misc
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Trigger guard & roll pin
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Installation Resources
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Watch our interactive install walkthrough video (linkable on product page) for step‑by‑step guidance.
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Read the LPK Install resource article for a detailed breakdown and torque/fit tips.
Notes & Compatibility
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Designed for standard AR‑15 lower receivers.
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Some lower receivers or aftermarket parts (non‑standard tolerances) may require light fitting.
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Does not include lower receiver, buttstock/brace, buffer tube, buffer, or extension — sold separately.