Faxon Firearms Adjustable Gas Block, AR-15, .625″ ID, Matte, Black
Original price was: $89.00.$82.00Current price is: $82.00.
Faxon Firearms Adjustable Gas Block, .625″ ID, Matte, Black for AR-15. Patent pending. 14 tactile detented settings. Anti-carbon-fouling screw placement. Works suppressed and unsuppressed.
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The Faxon Firearms Adjustable Gas Block is a patent pending low profile adjustable gas block built for AR-15 barrels with a .625 inch gas block journal. It features a unique adjustment screw placement that keeps the screw away from gas port carbon, and because of this, the block stays free from carbon fouling and does not seize up during extended use or suppressed fire. As a result, the Faxon adjustable gas block gives you consistent, hassle-free adjustability whether you run it suppressed or unsuppressed.
In addition, the block offers 14 tactile, detented settings so you can move between gas positions with a positive click and know exactly where you are in the adjustment range. Furthermore, each detented position holds firmly under recoil, so your gas setting stays put once you dial it in for your load and setup. Moreover, the low profile design fits under most free-float handguards, making this block a clean drop-in for any .625 AR-15 build that runs a free-float rail. The matte black finish keeps glare low and blends with standard AR components. When you want a Faxon adjustable gas block that gives you precise control over your rifle’s cycling and recoil for both suppressed and standard shooting, this one covers both.
However, this gas block fits .625 inch gas block journals only and does not work on .750 or .936 bore sizes. Therefore, confirm your AR-15 barrel’s gas block journal measures .625 before ordering the Faxon Firearms Adjustable Gas Block.
Faxon Adjustable Gas Block Key Features
- Patent pending low profile adjustable gas block for .625″ AR-15 barrels
- 14 tactile, detented adjustment settings
- Unique screw placement prevents gas port carbon contact — no fouling or seizing
- Works suppressed and unsuppressed
- Low profile design clears most free-float handguards
- Matte black finish
Specifications
| UPC | 816341028272 |
|---|---|
| Manufacturer | Faxon Firearms |
| Manufacturer Part # | GBA-LP-625-3 |
| Model | Adjustable Gas Block |
| Type | Gas Block |
| Description | .625 |
| Diameter | .625″ |
| Settings | 14 Tactile, Detented |
| Fit | AR-15 |
| Color | Black |
| Finish | Matte |
| Subcategory | Long Gun Parts |
| Type | Gas Block |
|---|---|
| Model | Adjustable Gas Block |
| Diameter | .625" |
| Settings | 14 Detented |
| Fit | AR-15 |
| Color | Black |
| Finish | Matte |
| Brand |
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Frequently Asked Questions
What does .625″ ID mean on a gas block?
The .625″ ID (inner diameter) refers to the bore of the gas block — it is designed to fit barrels with a .625-inch outside diameter at the gas block seat. This is a common diameter on lightweight, pencil-profile, and some mid-weight AR-15 barrels. Measure your barrel’s gas block journal before ordering to confirm compatibility, as .625″ and .750″ barrels are not interchangeable.
What is the advantage of an adjustable gas block?
An adjustable gas block allows the shooter to control the volume of gas bled from the barrel, enabling tuning for suppressed versus unsuppressed use, different ammunition loads, and different buffer weights. It is particularly useful on suppressed rifles, where increased backpressure from the suppressor can cause over-gassing with a fixed gas block.
How is the Faxon adjustable gas block installed?
The Faxon adjustable gas block installs on the barrel journal using set screws, replacing the existing fixed gas block. The gas port on the block must align with the barrel’s gas port before tightening. Access to the adjustment screw after installation typically requires a free-float handguard that leaves the gas block exposed or accessible.
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