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UTG PRO Stock – Mil-Spec AR-15 Stocks & Kits Made in the USA

Upgrade your AR-15 with the battle-tested reliability of the UTG PRO Stock series—designed, manufactured, and assembled in the USA. Known for quality, ergonomics, and unbeatable value, UTG PRO stocks offer a mil-spec fit, precision-molded polymer construction, and compatibility with buffer tubes, making them a go-to choice for tactical shooters, competitors, and firearm enthusiasts.

At Mounts Plus, we carry the full UTG PRO line—S1 to S4 stocks and complete kits—with fast shipping and expert support.

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✅ Why Choose a UTG PRO Stock?

When upgrading or building an AR-15, the stock you choose affects everything from handling to recoil control. UTG PRO’s AR stocks are built for performance and durability.

Key Benefits:

• 🔩 Mil-spec tube compatible – Secure fit on standard AR-15 buffer tubes

• 🧱 Impact-resistant polymer – Built to withstand field use

• 🎯 S1–S4 profiles – From compact CQB to full-size cheek weld support

• ⚙️ Optional stock kits – Include buffer tube, end plate, spring, and castle nut

• 🇺🇸 Made in the USA – With UTG’s lifetime warranty

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📊 Compare UTG PRO Stocks (S1–S4 Series)

All models are drop-in compatible with mil-spec buffer tubes.

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🔫 What Makes UTG PRO Stocks Unique?

Unlike many import stocks, UTG PRO stocks are:

• Precision-molded in Michigan

• Designed with multi-position notches

• Equipped with QD sling swivel slots (select models)

• Made to balance cost, weight, and stability

• Rated for 5.56 NATO and .308 recoil levels

Whether you're upgrading a duty rifle, building a lightweight carbine, or customizing a pistol lower, there's a UTG PRO stock for your mission.

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🧰 Stock Kits vs Standalone Stocks

Stock Kit Includes:

• Stock

• Mil-spec buffer tube

• Carbine spring

• Carbine buffer

• End plate

• Castle nut

Ideal for first-time AR builders or those replacing old parts.

Stock Only:

• Just the buttstock (no buffer components)

• Perfect for upgrades on an existing mil-spec tube

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🛠️ Installation & Compatibility

UTG PRO stocks are compatible with:

• 🔧 Mil-spec carbine buffer tubes (not commercial size)

• 🧱 AR-15, M4, and M16 lowers

• 🔁 Easy 5-minute swap with no gunsmithing

• ⚖️ Fit most braces or tube-style stocks on pistols (where legal)

Confirm your buffer tube is mil-spec diameter (1.14”) before purchasing.

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❓ Frequently Asked Questions

Are UTG PRO Stocks legal in all states?

Stock legality may vary by state for pistols or short-barrel rifles. Always verify local laws before installing.

What’s the best UTG PRO stock for a lightweight build?

The S1 offers the lightest, most compact profile—great for minimalist or CQB setups.

Are UTG PRO stocks made in the USA?

Yes. UTG PRO products are manufactured at their facility in Michigan.

Can I use these with a commercial buffer tube?

No. UTG PRO stocks are made for mil-spec buffer tubes only.

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🛒 Buy UTG PRO Stock Kits at Mounts Plus

Mounts Plus offers the full range of UTG PRO AR-15 stocks and kits with fast shipping and outstanding service.

✅ S1, S2, S3, and S4 series in stock
✅ Mil-spec compatible & ready to install
✅ Made in USA – backed by UTG's warranty
✅ Fast shipping from Florida warehouse
✅ Expert support if you need help choosing