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AR Folding Stock Adapter | Compact AR-15 Side Folding Adapters – Mounts Plus
AR Folding Stock Adapter – Compact, Compatible, and Ready to Install
Looking to improve the portability and tactical flexibility of your rifle or pistol build? An AR Folding Stock Adapter is the ideal solution. Whether you're running a backpack gun, building a compact truck rifle, or adding versatility to your AR pistol, a folding stock adapter lets you fold your buffer tube and stock to the side for easy transport and storage.
At Mounts Plus, we offer premium folding adap
ters from Sylvan Arms, engineered for mil-spec buffer tubes and direct impingement AR-15s.
✅ Why Choose an AR Folding Stock Adapter?
An AR folding adapter adds functional benefits to your build without requiring a gunsmith. It’s a simple upgrade that delivers:
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🔄 Side-folding capability for stocks and braces
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🧱 Compact profile for transport, storage, or concealment
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🔩 Mil-Spec threading for universal fitment
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⚙️ Fast installation – installs between lower receiver and buffer tube
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🧰 No permanent modifications required
Perfect for AR pistols, SBRs, PCCs, and compact rifle builds.
💡 What to Look for in a Folding Stock Adapter
| Feature | Why It Matters |
|---|---|
| Thread Spec | Most use 1-3/16 x 16 (mil-spec) |
| Material | Look for 7075 aluminum or steel |
| Carrier Extension Included | Needed to maintain proper bolt travel |
| Weight | Keep under 6.5 oz for balance |
| Fold Direction | Left or right fold depending on setup |
📊 Compare Our AR Folding Stock Adapters
| Adapter Model | Fold Direction | Weight | Material | Price |
|---|---|---|---|---|
| Sylvan Arms Gen 4 Folding Adapter – RH | Right-Folding | 6.0 oz | 7075 Aluminum | $184.00 |
| Sylvan Arms Gen 4 Folding Adapter – LH | Left-Folding | 6.0 oz | 7075 Aluminum | $184.00 |
Includes bolt extension, locking hardware, and instructions. No need to remove your buffer retainer pin.
🔩 Installation Overview
Installing your AR folding stock adapter takes only a few minutes:
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Remove buffer tube and end plate
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Thread adapter into rear of lower receiver
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Add supplied bolt carrier extension
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Attach buffer tube and stock
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Test function, folding clearance, and lockup
No permanent modification is required. Reversible anytime.
Compatible With:
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✅ Mil-spec AR-15 rifles
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✅ AR pistols with buffer tubes
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✅ AR-10s (check extension length)
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✅ 9mm & PCC platforms
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❌ Not for blowback 22LR without carrier weight mod
❓ FAQ – AR Folding Stock Adapter
What is an AR folding stock adapter?
It’s a threaded device that goes between your lower receiver and buffer tube, allowing your stock or brace to fold to the side for compact carry.
Is this compatible with my AR-15?
Yes – as long as your rifle or pistol uses a standard buffer tube and bolt carrier group. Compatible with most mil-spec lowers.
Can I shoot my AR with the stock folded?
No. The BCG must return through the buffer tube. This adapter allows for folding when not firing, not while firing.
What’s the difference between Sylvan Arms and Law Tactical?
Sylvan Arms is lighter and more affordable, while Law Tactical is heavier-duty and often used in duty builds.
🛒 Shop AR Folding Stock Adapters at Mounts Plus
Mounts Plus is your trusted source for AR-15 accessories and upgrades. We stock:
✅ Folding stock adapters from Sylvan Arms
✅ Left- and right-folding models
✅ Lightweight, durable 7075 aluminum builds
✅ Fast shipping and expert support
✅ Compatible with most AR-15 rifles and pistols