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There's a whole family of platforms out there that borrow the AR-15's buffer tube threads without actually needing a buffer tube. Piston-driven uppers, rimfire conversions, and other bufferless setups all use that rear receiver ring, and this KNS Precision adapter gives you a smarter way to use it. Instead of a tube, you get a clean M1913 Picatinny rail that accepts a huge range of folding stocks and braces, including popular SIG MPX and MCX-style options.
The standout here is that flange in the base of the Picatinny plate. On a traditional AR-15 lower, the endplate is what traps your takedown pin detent and spring. This adapter takes over that job, so you keep your rear takedown pin working exactly as it should while still gaining a modular rail mount. That's the whole reason to grab the flanged version over the slim non-flanged one, and it makes this the right pick for anyone building on an AR-style receiver.
The kit is refreshingly simple. An externally threaded plug screws into your buffer socket, the rail section drops into the slot on that plug, and a hex-socket bolt with a lock washer clamps the whole thing down tight. Low parts count means fewer things to fuss with and a rock-solid interface once it's torqued. KNS builds these out of their Texas machine shop, and the outfit has a long reputation for precise, well-made AR and AK components.
One thing to be clear on: this is meant for bufferless applications where the carrier does not extend past the rear receiver ring. It won't run a standard direct-impingement AR-15, and it isn't the combo for pairing a standard AR lower with an MCX upper. If your platform uses those buffer threads purely as a mounting point and not for a recoil spring, this is a clean, purpose-built solution that's covered by a KNS patent and their lifetime warranty on manufacturer defects.
No, this is built for bufferless platforms where the bolt carrier does not extend past the rear receiver ring. A standard direct-impingement AR-15 needs its buffer, spring, and tube to cycle, so this adapter isn't the right fit for those. Think piston-driven uppers, rimfire conversions, and similar setups that only use the buffer threads as a mounting point.
The flange sits in the base of the Picatinny plate and takes over the job of your AR-15 endplate. That means it holds your takedown pin detent and spring in place on a traditional lower receiver. If you're building on an AR-style receiver, the flanged version is the one you want over the slimmer non-flanged model.
Any standard M1913 Picatinny-interface folding stock or brace will attach, which opens up a wide range of options. It's commonly paired with SIG MPX and MCX-style folding stocks, along with 1913 braces from various makers. That flexibility is the whole point of swapping the tube for a rail.
Not at all. The threaded plug screws into your buffer socket, the rail section seats into the slot on the plug, and a single hex-socket bolt with a lock washer locks everything together. The low parts count keeps things simple and gives you a stable, secure mount once it's snugged down.
| UPC | 853906008492 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | AR-MCX Adapter with Flange |
| Color | Black |
| Length | 5.0500 |
| Model | |
| Product Type | Adaptor |
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