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The Yankee Hill Machine Low Profile Gas Block is one of those simple upgrades that makes a real difference on an AR build. It replaces your existing A2 front sight base with a slim, streamlined block that slips right under a modern free-float handguard, which means you can finally run that longer rail you've been eyeing. Machined from steel and coated in a mil-spec black phosphate, it measures .95 inches long with a .750" bore diameter, matching the standard barrel journal you'll find on most off-the-shelf carbines and mid-length uppers.
The big draw here is the clamp-style mounting. Instead of relying on set screws that dig into your barrel, this block uses two clamping screws that pinch down evenly and hold rock solid once torqued. Folks who've run these mention how easy they are to align, and once you cinch down the two screws they stay put with no drifting. There's no dimpling required, so if you'd rather not take a drill to your barrel, this is a clean way to go. Add a dab of red thread locker and it isn't going anywhere.
Installation is about as painless as it gets for a gas system swap. You pull your old front sight base, slide this block over the barrel, line it up with the gas port, drop your gas tube in and tighten the clamping screws. That's the whole job. Because the profile sits low, it clears the inside of most standard-diameter free-float handguards without any fuss, though it's always smart to double check the inner diameter of your particular rail before ordering.
YHM has been building AR parts and accessories for decades out of Massachusetts, and this gas block reflects that reputation for solid, dependable gear at a fair price. It's a practical pick whether you're finishing a fresh build or modernizing an older rifle with a longer handguard setup.
It's designed to sit low so it clears the inside of most standard free-float rails, which is the whole point of going low profile. That said, handguard inner diameters vary between brands, so it's worth measuring or checking your rail's specs before you buy. Some tighter or narrower rails may not leave enough room, so a quick check saves headaches down the road.
No dimpling required. Because this is a clamp-style block, the two clamping screws pinch down and grip the barrel evenly rather than relying on set screws that need a dimple to seat into. Just line it up over the gas port and torque it down. Many builders add a bit of red thread locker for extra peace of mind.
This block is made for barrels with a .750" journal diameter, which is the standard on most factory AR-15 carbine, mid-length, and HBAR barrels. If you're running a non-standard or bull barrel, you'll want to measure your barrel diameter first to be sure. For the majority of off-the-shelf uppers, .750" is the size you're looking for.
No, the gas tube is sold separately. You'll get the gas block itself along with its two clamping screws. Make sure you grab the correct gas tube length for your setup, whether that's carbine, mid-length, or rifle, based on where your gas port sits.
| UPC | 816701013580 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | YHM-9384 |
| Color | Black |
| Length | 5.1000 |
| Model | |
| Product Type | Gas Block |
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