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This is the classic A2-style front sight tower that anchors so many AR-15 builds, and CMMG's take on it is the real deal. It's an F-marked base machined for barrels with a .750" gas journal, which is the standard size on most carbine and mid-length barrels. That F marking matters more than it looks. It means the sight sits slightly taller so your front post lines up correctly with a rail-mounted rear sight on a flat-top upper, instead of the older A1 height meant for fixed carry handle guns.
Construction is forged steel with a matte black phosphate finish, so it handles heat, recoil, and years of hard use without flinching. The tower comes with the sight post installed and adjustable for elevation, plus the integrated sling loop that accepts most standard two-point slings and the A2 bayonet lug for anyone chasing a military-correct clone. The ramped, glare-cutting profile is exactly what you'd expect from a proper mil-spec base.
Guys putting together A2, A4, or M4-style rifles reach for this part because it hits mil-spec dimensions and pairs cleanly with nitride and phosphate barrels. It also serves double duty as a gas block, routing gas back to the tube while giving you a permanent, no-nonsense iron sight up front.
Heads up on this one: the base is not pre-drilled for taper pins. It's meant to be drilled and pinned onto the barrel, and getting the gas port aligned dead-on at 12 o'clock takes the right tools and a steady setup. Most folks hand this off to a gunsmith or an experienced builder rather than fighting it at the kitchen table. Taper pins and the front sight post detent hardware are worth confirming before you start, since some builders order those separately depending on their barrel.
It's built for AR-15 barrels with a .750" gas journal, which is the standard size on most carbine and mid-length barrels. The mounting area on the barrel needs roughly two inches of clearance for the base to sit correctly. If your barrel has a larger journal, this won't be the right fit.
The F designation means the sight tower is the taller height meant for flat-top and A4-style upper receivers. It corrects the sight-over-bore relationship so your front post aligns with a rail-mounted rear sight. On a fixed carry handle A1 rifle you'd want the shorter standard base instead.
This base is not pre-drilled for taper pins and typically ships without them. It's designed to be drilled and pinned onto the barrel during installation. Plan to confirm your taper pins before you start the job, since builders often source those separately depending on the barrel.
It's not a drop-in part. Mounting requires drilling the barrel and taper-pinning the base while keeping the gas port aligned at 12 o'clock, which takes proper tooling and know-how. Most people have a gunsmith or seasoned AR builder handle it to get the alignment right the first time.
| UPC | 810046232224 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 55DA3EA |
| Color | Black |
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