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When you pull a standard A2 front sight off an AR-15 to run a free-float rail, you're left with two ugly taper pin holes and a chunk of bare barrel that never quite looks finished. Troy's 2-inch low-profile gas block was built to fix exactly that. At a full 2 inches long, it covers more real estate than a typical short block, hiding those pin holes and giving you a clean, seamless look under the rail.
This one is machined from 4140 pre-hardened steel and coated in a MIL-STD Manganese Phosphate finish, so it holds up to heat and stays rust-resistant through plenty of range time. It's sized for the common .750 gas block seat, which is the standard diameter on most medium-profile AR-15 barrels. The block clamps down tight using two set screws underneath, keeping it planted even under high-volume fire.
The extended 2-inch body is the real story here. Shorter blocks can leave a scarred or unfinished section of barrel exposed once the front sight base comes off, and this one buries that section for a much cleaner build. Guys running everything from stainless barrels to standard black uppers have noted the fit and finish are dead-on, and it slides right under free-float rails like a Geissele without drama.
Installation is straightforward for anyone comfortable working on their AR. Confirm your barrel has a .750 gas block seat, seat the block over the gas port, line up your gas tube, and snug down the two set screws. Keep in mind the gas tube roll pin is not included in the box, so grab one if you don't already have it on hand. Pair it with a gas tube that matches your barrel's system length and you're set.
Yes, that's the whole point of the extended 2-inch design. When you remove a standard fixed front sight base, it leaves behind taper pin holes and some scarred barrel, and this block is long enough to cover that section for a clean look under your rail. It gives you a finished appearance without exposed spots that can invite rust.
It fits AR-15 barrels with a .750 inch gas block seat, which is the standard diameter on most medium-profile barrels. Just check your barrel's advertised spec before ordering. If your barrel is a lighter pencil profile, it may use a smaller .625 seat instead.
No, the gas tube roll pin is not included with this block. You'll want to have one on hand along with a gas tube that matches your barrel's system length before you start the install. The two set screws that secure the block to the barrel are included.
As long as your Ruger has a .750 gas block seat, this block will fit. You can typically reuse your existing gas tube as long as it's the correct length for your barrel and gas system. Confirm your barrel diameter first, since that's what determines fit.
| UPC | 812699014585 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | SGAS-2LP-00BT-00 |
| Style | Low Profile |
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