AR Parts

Quality AR parts kits, triggers, receivers, handguards, BCGs, and AR-15 accessories.
Welcome to the parts counter. Ready to build a truly custom AR-15 from scratch? It’s all here: Upper parts, lower parts, rail attachments, grips, handguards — you name it, we’ve got it.
Need help picking parts? Start with our Builder’s Master Guide.
AR Lower Parts: What’s in a Receiver?
We’ve sourced quality, mil-spec lower receiver internals and components so you can complete your AR-15 build with confidence backed by guaranteed compatibility. The AR lower parts assembly includes the following:

Stripped lower receiver, or fabricated 80% Lower
Lower parts kit
Buffer tube
Buffer and recoil spring
Pistol grip
Castle nut
Latch plate

Grips, castle nuts, and latch plates are typically included in the lower parts kit. An upgraded latch plate (like this Magpul ASAP QD plate) includes a QD sling stud mount for easy carrying. An upgraded drop-in or “cassette” trigger (like this JMT Single Stage) provides a better trigger pull with less weight and faster, smoother resets for improved accuracy.
Ready to assemble? Here’s how to install your lower parts kit.
Not sure what parts you need? Check out our full lower assemblies!
AR Upper Parts: Everything You Need
Your finished AR upper is the “business end” of your rifle or pistol: It’s responsible for chambering and firing live rounds. So, you’re going to want the highest-quality parts for reliability and accuracy. That means investing in a 4150 CMV barrel, an M16-type bolt carrier group, and a forged M4-type upper receiver. We’ve got all those components available at great prices.
Want to make it even easier? We’ve got tons of barreled upper assemblies, pre-built with a bolt included, ready for install. Options are available for .308, 6.5 Creedmoor, .223 Wylde, 300 Blackout, and 9mm, and of course, 5.56 NATO.
Here’s how to install the AR-15’s barrel, gas system, and handguard.
Grab Your Gunsmithing Tools, Too!
Ever try to install an LPK without punches? You probably wound up losing some of those tiny roll pins, halting your build. Get rid of the frustration and guesswork and grab the tools you need to confidently attack your 80% project. We’ve got quality Armorer’s Wrenches, torque wrenches, roll pin kits, vise blocks, and all the other gunsmithing tools you need to go from a hunk or aluminum or polymer to a locked n’ loaded shooter. Grab a complete Armorers Kit like the Wheeler set, and you’ll have virtually all the tools required.
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