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AR-15 Stock Kit | Complete Mil-Spec & Commercial Kits
AR-15 Stock Kit – Complete Mil-Spec & Commercial Kits for Rifle Builds
Looking to upgrade or complete your AR-15 build? A reliable AR-15 Stock Kit includes everything you need for a secure, adjustable, and comfortable buttstock installation. At Mounts Plus, we stock premium complete stock kits from leading brands like UTG PRO, ATI, VLTOR, Luth-AR, and CMMG—all ready to ship.
Whether you're starting from a stripped lower or replacing worn-out parts, our AR-15 stock kits include the essential components for a hassle-free install and top-tier performance.
✅ What’s Included in an AR-15 Stock Kit?
Each kit is engineered for mil-spec or commercial AR-15 buffer tubes and typically includes:
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🔩 Adjustable or Fixed Stock (6-position, carbine, A2, etc.)
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🔧 Buffer Tube (Mil-Spec or Commercial diameter)
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🔩 Recoil Spring (Carbine or rifle-length)
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🧱 Carbine Buffer or Rifle Buffer
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🛠️ Castle Nut & End Plate
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🧰 Mounting Hardware
Our AR-15 stock kits are designed for drop-in compatibility with most AR-15 lower receivers.
📊 Compare the Best AR-15 Stock Kits
| Product Name | Tube Spec | Stock Type | Includes Buffer & Spring | Price |
|---|---|---|---|---|
| UTG PRO Ops Ready S1 Stock Kit | Mil-Spec | Collapsible | ✅ Yes | $69.97 |
| ATI TactLite GEN2 Stock Kit | Mil-Spec | Adjustable | ✅ Yes | $94.99 |
| VLTOR EMOD Complete Stock Kit | Mil-Spec | Collapsible | ✅ Yes | $196.45 |
| CMMG A1 Receiver Extension & Stock Kit | Rifle | Fixed | ✅ Yes | $99.95 |
| Luth-AR A2 Buttstock Kit | Rifle | Fixed | ✅ Yes | $145.83 |
Need help choosing the right AR-15 stock kit? Contact our support team for expert advice.
🔩 Mil-Spec vs Commercial AR-15 Stock Kits
Mil-Spec Buffer Tubes
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Diameter: 1.14”
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Compatible with most premium stocks
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Tighter fit for better stability
Commercial Buffer Tubes
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Diameter: 1.17”
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Typically used in entry-level builds
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Not interchangeable with mil-spec stocks
✅ All kits list their spec clearly—double-check before you buy!
🧰 AR-15 Stock Kit Use Cases
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🧱 Full rifle builds – Complete your stripped lower with a quality kit
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🔄 Stock replacements – Replace outdated or damaged components
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🔫 Upgrades – Add QD sling mounts, cheek risers, or lighter setups
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🧩 Build compatibility – Choose kits based on rifle vs pistol length and buffer spec
❓ FAQs – AR-15 Stock Kits
What is an AR-15 stock kit?
An AR-15 stock kit contains all the components needed to install a buttstock: buffer tube, stock, spring, buffer, end plate, and castle nut.
What’s the difference between a carbine and rifle stock kit?
Carbine kits use a shorter buffer tube and buffer. Rifle kits use longer fixed stocks and require rifle-length tubes and springs.
Can I install this kit on a commercial buffer tube?
Only if the kit is labeled commercial. Mil-spec kits are not compatible with commercial-diameter tubes.
Do I need special tools?
A buffer tube wrench and vice block are recommended, but most installs take under 10 minutes.
🛒 Shop AR-15 Stock Kits at Mounts Plus
At Mounts Plus, we offer high-quality AR-15 stock kits for every shooter and build. Whether you're replacing a factory stock or completing a custom build, you'll find:
✅ Mil-Spec & Commercial Compatibility
✅ Adjustable, Fixed, and Precision Stocks
✅ Fast, U.S.-based shipping
✅ Competitive pricing
✅ Trusted brands & in-stock selection