AR-15 Build Kits

AR-15 Build Kits

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Frequently Asked Questions about AR-15 Build Kits

  • What is an AR-15 Build Kit?

    An AR-15 Build Kit provides nearly everything you need to assemble an AR-15, excluding the lower receiver (legally considered the firearm). These kits typically include a complete upper receiver, a lower parts kit (LPK), and a buffer tube assembly, allowing enthusiasts to customize their rifles while assembling them from the ground up.

  • Why doesn’t the AR-15 Build Kit come with a lower receiver?

    The lower receiver is classified as the serialized firearm component under U.S. federal law and must be purchased through a Federal Firearms License (FFL) holder. By excluding the lower receiver, build kits can be sold without requiring background checks or the regulatory process associated with buying a complete firearm.

  • Is an AR-15 Build Kit compatible with all AR-15 lower receivers?

    Most AR-15 Build Kits are compatible with mil-spec lower receivers. However, proprietary features or unique dimensions, such as billet lowers or enhanced trigger guards, may require specific parts. Always confirm compatibility to avoid fitment issues.

  • Do I need special tools to assemble an AR-15 Build Kit?

    Basic hand tools are sufficient for assembly, but specialized tools like an armorer’s wrench, roll pin punch set, vise blocks, and a torque wrench can make the process easier and ensure safe, accurate assembly.

  • What types of calibers are available for AR-15 Build Kits?

    AR-15 Build Kits are available in calibers such as 5.56/.223 Remington, .300 Blackout, 7.62x39mm, 6.5 Grendel, and .224 Valkyrie. Your choice should depend on the intended use, such as home defense, hunting, or long-range shooting.

  • Are AR-15 Build Kits easy to assemble for beginners?

    Yes, AR-15 Build Kits are beginner-friendly with the help of detailed guides and online tutorials. While assembly requires attention to detail and patience, no specialized gunsmithing expertise is necessary.

  • Do AR-15 Build Kits include sights or optics?

    Most AR-15 Build Kits do not include sights or optics. This allows builders to select optics suited to their specific needs, such as red dots for close-quarters or scopes for long-range shooting.

  • Is there any fitting required when using an AR-15 Build Kit?

    Most AR-15 Build Kits adhere to mil-spec standards and fit together without issues. Minor fitting may occasionally be needed due to manufacturing variations and can often be resolved with proper lubrication or adjustments.

  • Are there legal restrictions on building an AR-15 from a Build Kit?

    In the U.S., it is legal to build an AR-15 for personal use as long as federal, state, and local regulations are followed. These include compliance with barrel length requirements, feature restrictions, and potential registration rules. Research local laws before starting your build.

  • How do I know if an AR-15 Build Kit is good quality?

    High-quality AR-15 Build Kits use materials like 7075-T6 aluminum for receivers and 4150 CMV steel for barrels. Look for reputable manufacturers, user reviews, and features like magnetic particle inspection (MPI) for critical components. Trusted brands like Aero Precision offer reliable, high-quality kits.