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Faxon's Low Profile Gas Block is one of those parts that does its job and gets out of the way. It's machined for barrels with a .625-inch gas journal, which covers most pencil and lightweight barrel profiles, and the slim footprint tucks right under modern free-float handguards without any fuss. The steel body is drilled through the middle to shave weight, so you're looking at about 0.07 pounds sitting on the barrel. If you're chasing a lighter build, that adds up.
Where a lot of blocks stop at two set screws, this one runs three on the underside, all driven by an Allen key. That extra screw gives you a bit more bite and peace of mind when things heat up. Builders who've run these tend to point out the tight fitment and clean machining, and it lines up nicely with Faxon barrels and standard gas tubes. The nitride finish gives it a matte black look that matches most barrels and holds up to the heat and abuse a gas block takes.
Installation is straightforward for anyone who's built an upper before. Slide it over the gas port, line it up 180 degrees from the port, and snug down the screws. For the long haul, dimpling your barrel under at least one or two of the set screws and adding a quality thread locker is the way to go. Gas blocks get seriously hot, so pick a thread-locking compound rated for the kind of shooting you plan to do. One thing worth noting before you order: the gas tube roll pin is not included, so grab one if you don't already have it on hand.
Whether you're finishing a lightweight range gun or a trimmed-down carbine, this block delivers the low-profile clearance and secure hold you want from a part that's easy to overlook but critical to how your rifle runs.
It's made for AR-15 barrels with a .625-inch diameter gas journal, which is common on pencil and lighter-weight profiles. You'll want to measure your barrel's gas journal before ordering, since many heavier barrels use a .750 diameter instead. If your barrel measures .625, this is the right block.
Dimpling isn't strictly required, but it's strongly recommended for a set-screw block like this one. A dimple gives the screw tip a seat to bite into, which keeps the block from rotating or walking forward under heat and recoil. Pairing that with a good thread locker is the surest way to keep it locked in place.
No. The block ships with its three mounting set screws only. You'll need to supply your own gas tube and roll pin, so plan on picking those up if you don't already have them.
The third screw adds a little extra clamping security compared to the typical two-screw setup. It gives you more contact with the barrel and a bit more insurance against the block loosening over a long session. Many builders like dimpling at least two of the three for the most solid hold.
| UPC | 816341021006 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | GB-LP-625-3 |
| Color | Black |
| Length | 6.2000 |
| Model | |
| Product Type | Gas Block |
| Style | Low Profile |
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