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Building on a bull barrel and need a gas block that disappears under your rail? TROY's .875 Low Profile Gas Block is cut specifically for barrels with a 0.875 inch gas block seat, which is common on heavier profile .308 barrels and larger caliber builds. The slim profile is the whole point here. It sits low enough to slide under free float handguards and drop-in rail systems that extend past where a factory front sight or standard gas block would normally live.
TROY machines this block from 4140 pre-hardened steel and finishes it in MIL-STD manganese phosphate, so you get real durability and corrosion resistance rather than a coating that wears off after a few range trips. It secures to the barrel with two set screws on the underside of the block. Plenty of builders run these dry and torqued, though a lot of folks add a dab of thread locker for extra insurance against recoil backing them out. If you want the most secure hold, dimpling the barrel under the set screws is a proven trick.
This one is designed around the 0.875 inch seat, so it works with Armalite .308 heavy barrels and other calibers that share that diameter, including popular big-bore builds like .458 SOCOM. Builders consistently report a clean, tight fit and easy install with basic tools, no gunsmith required. One thing to plan for: the gas tube roll pin is not included, so grab one separately if your build needs it.
TROY has been turning out AR parts since 2003, and their fit and finish reputation shows up in the machining on this block. It's a straightforward, no-frills piece that does exactly what a low profile gas block should do, letting you run the handguard setup you want without a bulky assembly getting in the way.
It's designed for barrels with a 0.875 inch gas block seat, which covers Armalite .308 heavy barrels and other calibers sharing that diameter. Measure your barrel's seat diameter before ordering to confirm the fit. Builders also run these on big-bore setups like .458 SOCOM that use the same .875 seat.
No, the gas tube roll pin is not included with this gas block. You'll need to pick one up separately if your build requires it. The set screws for mounting the block to the barrel are included.
It's a set screw style block that secures with two screws on the underside. Many builders add non-permanent thread locker for extra hold against recoil, and dimpling the barrel under the set screws gives you the most secure, repeatable installation. Basic tools are all you need for the job.
The slim profile lets the block sit low enough to fit under free float handguards and rail systems that extend past the gas block area. That's exactly what you want if you're replacing a fixed front sight or bulky factory block to run a modern free float rail. The 4140 steel and manganese phosphate finish keep it durable through hard use.
| UPC | 812699014578 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | SGAS-875-00BT-00 |
| Color | Black |
| Product Type | Gas Block |
| Shipping Weight | 0.0135 |
| Style | Low Profile |
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