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The Luth-AR A2 Rear Sight Assembly Kit is the full parts package you need to build out the rear sight on an A2 carry handle upper receiver. Whether you're piecing together a retro service-rifle clone, finishing a fresh build, or bringing an old A2 back to life, this kit gives you every knob, spring, pin, and screw required to get that classic sight picture dialed in. It ships as separate components, so plan on some bench time to put it together rather than a bolt-on install.
This is a true A2-style setup with independent windage and elevation adjustment. The elevation knob lets you dial known distances on the fly, while the windage knob fine-tunes left and right with positive, repeatable clicks. That combination is what made the A2 rear sight a mainstay on service-style rifles for decades, and it still holds up as a rugged backup or primary iron sight today.
The flip aperture gives you two sighting options: a larger opening for fast, close-in target acquisition and a smaller peep for tighter groups at distance. It's a simple, proven design that works well whether you're running the rifle at the range or reaching out farther. Built from steel with a matte black finish, the parts are made to take a beating and shrug off wear.
Since the kit arrives as loose parts, it helps to have the Luth-AR schematic handy and to work over a clean surface so the small springs and ball bearings don't wander off. Those tiny detent parts are easy to launch across the room, so take your time during assembly. Folks comfortable with AR platform work can knock this out at home, though anyone unsure about the springs and detents may want a gunsmith to handle the fitment. Once it's together and mounted, you've got a solid, field-proven rear sight ready to zero.
This kit is built to mount on an AR-15 A2 upper receiver, meaning the fixed carry handle style upper. It's the go-to option for finishing a retro or service-rifle clone build. If your upper has the integrated A2 carry handle, this is the rear sight assembly you're looking for.
Yes, this kit ships as separate parts and needs to be assembled before it goes onto your upper. You get every component including the base lug, knobs, springs, pins, ball bearings, and screws. It's a good idea to keep the Luth-AR schematic nearby and work over a clean surface so the small detent springs and ball bearings don't get lost.
If you're comfortable working on AR platforms and have a little patience with the small detent parts, you can absolutely do this at home. The trickiest bits are the ball bearings and springs, which like to jump if you're not careful. Anyone who'd rather not fuss with those small parts can have a gunsmith handle the assembly and fitment.
It does. The A2 design gives you an elevation knob for dialing distance and a windage knob for left-right corrections, both with positive clicks. It also includes a dual aperture setup with a larger opening for fast target acquisition up close and a smaller peep for precision at longer range.
| UPC | 812058032250 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | UR-21K |
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