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Adjustable Gas Blocks for AR-15 – Precision Control for Every Build

If you're serious about dialing in your AR-15's performance, an adjustable gas block is one of the smartest upgrades you can make. Whether you're running a suppressor, tuning for competition, or simply want to reduce recoil and carbon buildup, these components let you take full control over your rifle's gas system.

At Mounts Plus, we carry a wide selection of adjustable gas blocks that fit barrel diameters of .625, .750, .875, and .936. Choose from trusted brands like Superlative Arms, SADLAK, YHM, Sons of Liberty Gun Works, and more—each built for reliability and precision.

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🔧 What Does an Adjustable Gas Block Do?

An adjustable gas block allows you to fine-tune how much gas is redirected into your AR-15's bolt carrier group after each shot. This simple adjustment can make a big difference in:

• Reducing recoil for smoother shooting
• Minimizing carbon fouling in the receiver
• Improving suppressor performance
• Enhancing cycling reliability with varied ammo types

It's the ultimate tool for shooters who demand control over their rifle’s operation.

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⚙️ Types of Adjustable Gas Blocks We Offer

We stock several styles to suit every build:

• Clamp-On Adjustable Gas Blocks: Easy to install, secure hold without marring the barrel
• Set-Screw Gas Blocks: Lightweight and popular for custom AR builds
• Bleed-Off Adjustable Gas Blocks: Ideal for suppressed rifles, these vent excess gas forward to reduce backpressure and blowback
• Low-Profile Designs: Perfect for free-float handguards and sleek builds

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🔍 Choose the Right Fit for Your Barrel

Gas blocks must match your barrel’s gas journal. We offer options for:

• .625 – Common on lightweight barrels
• .750 – Standard for most AR-15 builds
• .875 – Found on some heavy-profile barrels
• .936 – Ideal for bull barrels and precision platforms

Always measure your gas block journal before ordering to ensure proper fitment.

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🏆 Top Brands You Can Trust

We only carry brands known for quality, durability, and innovation:

• Superlative Arms – Famous for their bleed-off technology
• SADLAK – Known for rugged clamp-on designs
• YHM (Yankee Hill Machine) – Budget-friendly with dependable performance
• Sons of Liberty Gun Works – Hard-use rated for serious shooters
• ODIN Works, JP Enterprises, and More

⭐ Why Buy from Mounts Plus?

• 🔧 Expert-curated product selection

• 🚚 Fast shipping across the U.S.

• ✅ Trusted by gunsmiths and competitive shooters

• 💬 Real reviews from real shooters

We’ve helped thousands of AR owners upgrade their rifles—let us help you fine-tune yours with the right adjustable gas block.

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Related AR-15 Accessories You Might Need

To complete your build or fine-tune your gas system, don’t miss these popular options:

• AR-15 Gas Tubes – Pair your gas block with the correct-length gas tube for reliable cycling.
• AR-15 Barrel Assemblies – Build from the barrel up with precision-crafted assemblies.
• Muzzle Devices for AR-15 – Reduce flash and recoil with the right compensator or muzzle brake.
• Scope Mounts & Optics – Optimize your shooting experience with solid mounts and optics.
• AR-15 Rail Systems – Choose a handguard that provides the space and compatibility your setup demands.
• AR-15 Lower Parts Kits – Ensure smooth function from trigger to takedown pins.

Explore more in our AR-15 Parts & Accessories collection to build the rifle that performs exactly how you want.

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❓ Frequently Asked Questions

Q: Do I really need an adjustable gas block for my AR-15?
If you use a suppressor, shoot lightweight or match ammo, or want to reduce recoil, an adjustable gas block can noticeably improve performance and longevity.

Q: What’s the difference between clamp-on and set-screw gas blocks?
Clamp-on blocks grip the barrel without marking it and are easier to install. Set-screw blocks are lighter and better for permanent or competition builds.

Q: How do I know which size gas block to buy?
Measure your barrel’s gas journal diameter with calipers. Common sizes include .750" and .936" — check your barrel specs or manufacturer details.

Q: Are bleed-off gas blocks better for suppressors?
Yes. Bleed-off models vent gas forward, reducing blowback and carbon buildup when running suppressed.

Q: Is this something I can install myself?
Absolutely. Many shooters install their own gas blocks with basic tools, though a gunsmith can ensure optimal alignment and torque.

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🛒 Ready to Upgrade Your AR-15?

Browse our full selection of adjustable gas blocks and take your build to the next level. Whether you're competing, suppressing, or just want better performance—Mounts Plus has what you need.