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The San Tan Tactical Low Profile Gas Block is one of those parts you don't think about much once it's installed, which is exactly how a gas block should be. It sits at the .750 diameter, which is the most common barrel size on AR-15 and AR-10 builds, and its low, narrow shape lets it slide right under most free-float handguards. That clean footprint is what makes low-profile blocks so popular for modern rifles running slim rails and front sight-free setups.
This one is machined from 17-4PH stainless steel, which is a step up from your average steel block when it comes to handling the heat and pressure right at the gas port. It comes in a matte black finish that shrugs off wear and corrosion and blends in with the rest of your build. Because it's a single-piece design, there's less to worry about in terms of alignment and fitment once it's dialed in over the gas port.
The block secures to the barrel with dual hex head set screws that come included, so you're not hunting for extra hardware to finish the job. It plays nice with San Tan Tactical's own nitride gas tubes as well as any standard mil-spec gas tube, meaning you can mix and match with whatever's already in your parts bin. One thing worth remembering is that the low-profile design is meant to live under a free-float handguard rather than sit exposed, so plan your rail choice accordingly.
For anyone building out a carbine, mid-length, or rifle-length gas system on a .750 barrel, this is a straightforward, well-made piece that gets the gas routing right without adding bulk. It's a solid pick whether you're assembling from scratch or swapping out a block that's seen better days.
It's built for barrels with a .750 inch outer diameter at the gas port, which is the most common size across AR-15 and AR-10 barrels. Before ordering, measure your barrel at the gas port to confirm you've got a .750 profile and not a .625 or .936. If the numbers match, this block drops right on.
No, the gas tube is sold separately. The block does include its dual set screws for mounting, but you'll need to add the gas tube in the length that matches your setup, whether that's carbine, mid, or rifle length. It works with San Tan's own nitride gas tubes or any standard mil-spec tube.
Yes, that's the whole point of the low-profile design. It's a low, narrow one-piece block made to tuck under most free-float handguards for a clean, streamlined look. Just make sure your particular rail has enough inner clearance, since diameters vary between brands.
It clamps down with two included hex head set screws that bear against the barrel. For the most reliable hold, many builders add a drop of blue thread locker to the screws and torque them evenly so the block stays put under recoil and heat. Proper alignment of the gas port hole is key to consistent cycling.
| UPC | 680599034237 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | STT-GB-750 |
| Color | Black |
| Model | |
| Product Type | Gas Block |
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