Find AR-15 parts and accessories by assembly or component type. Shop build kits, upper and lower receiver products, barrel accessories, charging handles, bolt carrier groups, triggers, handguards, gas systems, buffer systems, stocks, grips, and small replacement hardware. Check each product listing for its intended platform, caliber and manufacturer compatibility.

Shop AR-15 Parts & Accessories by Category

• Upper Receivers & Accessories: Browse upper receivers, charging handles, bolt carrier groups (BCGs), and forward assists.
• Lower Receivers & Accessories: Find lower receivers, safety selectors, and bolt catches, with small replacement hardware organized separately.
• Barrels, Gas & Buffer Systems: Shop barrels, gas blocks, gas tubes, gas rings, buffers, buffer tubes, buffer springs, and buffer kits by specification.
• Handguards, Rails & Furniture: Compare handguards, rail accessories, hand stops, foregrips, stocks, grips, and furniture kits; verify the correct mounting interface.
• Build Kits & Small Parts: Explore AR-15 build kits and upper or lower parts kits, or shop individual springs, pins, detents, rings, clips, screws, and other hardware in the dedicated small-parts category.

AR-15, AR-10, M4 & M16 Compatibility

AR-15 and AR-10 style firearms share many design concepts, but components are not universally interchangeable. AR-10 and other large-frame platforms can also vary between manufacturers. Always confirm the exact platform, caliber, receiver pattern, barrel extension, bolt, handguard, buffer system, and other dimensional requirements before selecting replacement or upgrade parts.

Choosing the Right Replacement Parts and Accessories

When replacing or upgrading components, compare the original firearm specifications with the new part's dimensions, caliber rating, interface, materials, and manufacturer compatibility information. Some components may require proper installation, fitting, torque specifications, headspace verification, or inspection by a qualified gunsmith.