CMMG Front Sight Base Assembly Fixed Iron Sight
CMMG
$56.69
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CMMG
CMMG Front Sight Base Assembly Fixed Iron Sight
The CMMG Front Sight Base Assembly (F-Marked) is a precision-made replacement front sight and gas block combo designed for AR-15 style rifles with a .750" diameter gas journal, delivering reliable iron sight performance and a secure sling attachment point.
- F-marked design indicates compatibility with A2-style front sight posts
- Engineered for .750" diameter gas journal barrels for a secure fit
- Includes front sight post for precise windage and elevation adjustment
- Integrated sling loop provides a solid, traditional sling mounting option
- Combines front sight and gas block functions into one durable assembly
- Built to mil-spec standards for consistent, dependable field performance
Who This Is For
This front sight base assembly is ideal for AR-15 owners restoring a classic A2-style sight setup, replacing a damaged front sight block, or building a traditional fixed-sight rifle. Because installation requires a barrel vise, upper receiver block, and front sight base taper pins, this part is best suited for experienced gunsmiths or builders with the proper tools — professional installation by a licensed gunsmith is strongly recommended.
Specifications
| Brand | CMMG |
|---|---|
| Model | Front Sight Base Assembly, F-Marked |
| Compatible Gas Journal Diameter | .750" |
| Sight Type | Fixed Front Sight / Gas Block Combo |
| F-Marked | Yes (A2 front sight post compatible) |
| Includes | Front sight post, sling loop |
| Platform | AR-15 / M16 pattern rifles |
| Installation | Requires gunsmith tools (taper pins, barrel vise) |
| Finish | Matte black |
Frequently Asked Questions
What does "F-marked" mean on a front sight base?
An F-marked front sight base is designed to work with flat-top upper receivers and carbine-length handguards. The "F" designation indicates a slightly taller front sight post height that compensates for the lower sight radius on flat-top rifles, ensuring the front and rear sights align correctly when using A2-style iron sights or a carry handle rear sight.
Will this front sight base fit my barrel?
This assembly is specifically designed for barrels with a .750" (standard) gas journal diameter — the most common size on mil-spec AR-15 barrels. It is not compatible with .625" low-profile or .936" heavy/bull barrels. Check your barrel specifications before purchasing to confirm the correct journal diameter.
Can I install this front sight base myself?
Installation of a front sight base requires specialized tools including a barrel vise, upper receiver action block, a taper pin punch set, and a hammer or hydraulic press to drive the taper pins. Improper installation can damage the barrel or affect accuracy and reliability. CMMG and Goodland Guns strongly recommend having this part installed by a licensed gunsmith.
