Faxon .625 Low‑Profile Adjustable Gas Block | 3 Screw Mount

The Faxon low profile adjustable gas block gives AR-15 builders precise, tool-friendly control over their gas system in a slim, rail-ready package. This .625 three-screw model features a patent-pending design with 14 tactile adjustment settings, so you can fine-tune cycling, recoil, and reliability to match your exact setup. It is the answer for anyone tired of an overgassed rifle beating itself up.

What the Faxon low profile adjustable gas block is and who it is for

This block is built for shooters who want to dial in their rifle rather than accept whatever the barrel came tuned for. It fits .625-inch barrel gas journals and is ideal for both suppressed and unsuppressed shooting, where gas needs can change dramatically. Run it open for reliable unsuppressed cycling, then close it down when you thread on a can to cut back gas to the face.

Competitors, suppressor owners, and detail-oriented builders will get the most from it. The Faxon low profile adjustable gas block turns gas tuning into a simple, repeatable process.

Key features

• Compatible with .625-inch barrel gas journals
• 14-position adjustable gas flow for fine-tuned cycling and recoil
• Patent-pending design that prevents carbon fouling of the adjustment screw
• Machined from high-strength steel with a corrosion-resistant black luster finish
• Secured with three set screws in a low-profile, handguard-friendly footprint

Specifications and materials

The Faxon low profile adjustable gas block is constructed from high-strength steel and finished in a corrosion-resistant black luster, a combination that stands up to the heat and pressure of continuous fire. The standout feature is the patent-pending adjustment system, which keeps carbon from fouling the adjustment screw. That is the flaw that plagues cheaper adjustable blocks, and Faxon engineered around it.

Fourteen tactile detents let you make small, confident changes and return to a known setting without guesswork. The block clamps to the .625 journal with three set screws, holding position through recoil while staying slim enough to disappear under a free-float rail.

An adjustable gas block earns its keep the moment you run varied ammunition or a suppressor, because gas needs change with every configuration. Dial it back and you reduce bolt velocity, which softens recoil, slows brass ejection, and cuts the amount of gas blown back toward your face when a can is attached. That translates to a cleaner, more comfortable rifle and often longer parts life. The 14 detents let you find that sweet spot and mark it so you can return to it any time.

Installation, care, and compatibility

To set it up, mount the block on a clean .625 journal, align it with the gas port, and torque the set screws with thread locker. From there, start with the gas open, then close it click by click until the rifle just fails to lock back, and open it two clicks for a reliable margin. Repeat the process with your suppressor attached for a second known setting.

Maintenance is easy thanks to the fouling-resistant screw, though a periodic wipe keeps everything moving freely. This Faxon low profile adjustable gas block pairs with standard AR-15 gas tubes and free-float handguards, so it fits right into most builds. Explore our parts and upgrades section for matching tubes and rails, and trust Faxon engineering to keep your gas system dialed.

The patent-pending screw design is the detail that separates this block from cheaper adjustable options, which are notorious for carbon locking the adjustment screw solid after a few range trips. By keeping fouling off the screw, this block stays adjustable for the long haul, so the feature you paid for keeps working. Precision and 3-Gun shooters in particular lean on adjustable blocks to tune ejection patterns and reduce felt recoil. On a suppressed rifle, the payoff in comfort and cleanliness is immediate and obvious.

If you want a rifle that runs exactly how you tune it, the Faxon low profile adjustable gas block is the upgrade to make. Ships direct to your door, no FFL required.