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The Phase 5 Lo-Pro Gas Block does one job and does it well: it swaps out the tall, chunky front sight base on your AR-15 and drops your gas system down to a slim, low-profile footprint. That opens the door to running a longer free-float handguard over your gas block, which is exactly what most people are after when they upgrade a factory carbine. It fits .750 inch barrels and locks down with two clamping screws, so there's no dimpling required to get it seated.
Clamp-on blocks like this one wrap around the barrel and squeeze evenly, which a lot of builders prefer because it doesn't dig set-screw points into the barrel steel. It also makes alignment straightforward when you're lining the gas port up. Just take your time getting the port matched before you torque things down, and a dab of thread locker on the screws is cheap insurance for long-term peace of mind.
Phase 5 machines this block from 4140 chromoly steel and finishes it in mag phosphate, which is the same tough, heat-resistant recipe you'll find on quality bolts and barrels. Gas blocks sit right in the heat, so steel matters here. At roughly 1.8 ounces and measuring around 0.90 inch wide by 1.48 inch tall, it stays compact enough to clear most slim handguards while handling the temperatures a gas block deals with shot after shot. It's made in the USA, too.
This block covers the gas block only. The gas tube roll pin is not included, so if you're replacing your tube at the same time, grab one, since most gas tubes ship with the pin anyway. It's a great match for anyone converting a standard carbine to a free-float setup or cleaning up the look of an older build.
This block is built for .750 inch bore diameter barrels, which is the most common gas seat size on AR-15 barrels. Measure your barrel at the gas block journal before ordering to confirm you have a .750, since some heavier profiles use a larger diameter. If your barrel measures .750, you're good to go.
No. Because this is a clamp-style block, it wraps around the barrel and tightens with two screws rather than pressing set screws into the steel, so no dimpling is required. Just line the gas port up carefully before final torque, and a little thread locker on the screws helps keep everything locked in over time.
The package includes the gas block and its two clamping screws only. The gas tube and its roll pin are not included, so plan on sourcing those separately if you're building or replacing your gas system. Most gas tubes sold on their own already come with a roll pin, which makes it easy to complete the setup.
That's exactly what it's designed for. At about 0.90 inch wide and 1.48 inch tall, it drops your gas system down to a slim profile so you can run a longer free-float rail over the top. Check your handguard's inner diameter if you're running an especially slim rail, since clamp-on blocks sit a touch wider than bare set-screw styles.
| UPC | 813318021663 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | LOPROGAS |
| Model | |
| Product Type | Clamp |
| Style | Clamp |
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