AR-15 Gas Blocks

Adjustable, Low-Profile, Clamp-On & Set Screw Designs for Every Build

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Fine-Tune Your AR-15 with the Right Gas Block

Your AR-15’s gas block plays a vital role in its cycling, recoil, and reliability. Whether you're building a precision rifle, tuning a suppressed SBR, or replacing a worn-out part, the right gas block makes all the difference. At Mounts Plus, we carry a full selection of AR-15 gas blocks including:

• ✅ Adjustable gas blocks – ideal for suppressors or recoil tuning

• ✅ Low-profile gas blocks – perfect for free-float handguards

• ✅ Clamp-on or set screw models – easy to install and rock solid

• ✅ Options for all barrel diameters: .625", .750", .875", .936"

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🔍 What Type of Gas Block Do You Need?

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Match Your Barrel Diameter

Choosing the correct gas block diameter ensures proper alignment and reliable cycling. We carry gas blocks for:

• .625" barrels – pencil-profile or lightweight builds

• .750" barrels – standard government/mid-weight profile

• .875" barrels – heavy profile barrels

• .936" barrels – bull barrels / long-range setups

Always measure the gas journal or refer to your barrel specs before purchasing.

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Best-Selling AR-15 Gas Blocks

• Superlative Arms Adjustable Gas Block – Bleed-off design for suppressed builds

• Spike’s Tactical Low Profile Gas Block – Rock-solid steel with nitride finish

• Odin Works Clamp-On Adjustable Block – Perfect for lightweight or tuned rifles

• Geissele Super Gas Block – Precision-machined and built for abuse

• CMMG .750 Set Screw Gas Block – Affordable and reliable for standard builds

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Why Choose an Adjustable Gas Block?

If you're running a suppressor, dealing with overgassing, or want to reduce recoil, an adjustable gas block lets you control gas flow — improving function, longevity, and shootability. They're especially useful for:

• Suppressed builds

• Softening recoil

• Tuning bolt velocity

• Reducing fouling in the chamber

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Installation Types

• Set Screw – Insert over the gas journal and lock with screws

• Clamp-On – Tightens around the barrel; ideal for thin barrels

• Pin-On – For military-style or pinned setups (less common in DIY builds)

💡 Pro tip: Use thread locker and properly torque the screws. Consider dimpling the barrel for secure fitment if using a set screw block.

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AR-15 Gas Block vs Front Sight Base

• Gas Block – Minimal profile, fits under free-float rails, modern look

• Front Sight Base (FSB) – Integrated iron sight/gas block, older A2-style builds

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Frequently Asked Questions

Q: What size gas block do I need for a .750 barrel?
A: You need a .750" gas block for that diameter. Always match the block size to your barrel’s gas journal.

Q: What does an adjustable gas block do?
A: It lets you control the amount of gas that reaches the BCG, allowing you to tune recoil, cycle rate, and suppressor backpressure.

Q: Should I use clamp-on or set screw gas blocks?
A: Use set screw if your barrel is dimpled. Use clamp-on for lightweight barrels or when you don’t want to mark the barrel.

Q: Can I use a gas block under any free-float handguard?
A: Yes, low-profile gas blocks are specifically made to fit under free-float rails.

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Shop Gas Blocks Built for Performance

Mounts Plus offers top-tier AR-15 gas blocks for any use case — whether you're building a tuned suppressor host or upgrading a budget blaster. We stock trusted names like Geissele, Superlative Arms, Odin Works, CMMG, Spike’s Tactical, and more. All built to last and ready for any AR platform.

Order your AR-15 gas block today — precision, durability, and performance start here.