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There's something satisfying about finishing off a retro AR build with parts that actually look the part, and this rear sight assembly does exactly that. Made from steel with a matte black finish, it's built to hold up the same way the originals did while giving your carry handle that authentic old-school profile instead of a modern flip sight.
The standout feature here is the knurled windage knob styled after the early A1 rifles. It gives you that recognizable retro texture and shape under your fingers, and it still gets the job done with a proper click-based windage adjustment so you can dial in your zero without guesswork.
This assembly is built for A1-style upper receivers and carry handles, working alongside your front sight post to complete the classic sight picture. It includes a flip-style aperture so you can switch between apertures depending on your target distance, just like the setup it's modeled after.
Inside the kit you'll get the windage drum, detent, detent spring, aperture, windage screw, roll pin, and flat spring needed to complete the assembly. Installation involves seating the sight into the carry handle and securing it with the roll pin, so having a vise block or an extra set of hands to keep everything aligned while you tap the pin in makes the job go a lot smoother. Once it's seated, you've got a rear sight that looks and feels like it belongs on the original rifle it's paying tribute to.
This assembly is built specifically for A1-style upper receivers and carry handles, so it won't drop into an A2 carry handle without swapping components. If your build uses an A2 upper, you'll want the A2 version of this sight instead. Always double check your upper receiver style before ordering rear sight parts.
The retro knob has a knurled texture and shape that matches the early A1 rifles instead of the smoother look found on modern AR sights. It still functions the same way, giving you click based windage adjustment, but it's built to match the vintage aesthetic of a retro build.
It's steel construction with a matte black finish, which keeps it durable and true to the original mil-spec parts it's modeled after. That matte finish also helps cut down on glare while you're aiming.
No, this is the rear sight assembly only. You'll need to pair it with a front sight post or front sight base to complete your retro sight picture.
It uses the same click count as the original A1 mechanical zero specs, giving you enough range of adjustment to properly zero your rifle. Center is typically set several clicks in from the far left of the drum's travel.
It's a manageable job for anyone comfortable with basic AR parts installation, though seating the roll pin can be a little fiddly on your own. Having a vise block or a second set of hands to hold the sight steady while you drive the pin makes the process much easier.
| UPC | 812058032595 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | UR-21A-R |
| Color | Black |
| Model | |
| Style | Fixed |
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