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The KNS Precision AR/MCX Picatinny Stock Adapter without flange solves a specific problem: many modern firearms use the AR buffer tube interface for mounting stocks and braces, but they don't mechanically require an actual buffer tube or spring. That's where this adapter shines. It lets you mount Picatinny-style stocks, like folding options or modern braces, directly where the buffer tube would normally go.
The adapter comes as a two-piece kit with everything you need for installation. The externally-threaded adapter plug screws into your existing threaded buffer socket or ring. The Picatinny rail section fits into the adapter plug and gets secured with a hex-socket bolt and lock washer. The whole setup uses aluminum construction with a black matte finish, keeping things lightweight and corrosion-resistant.
Unlike a flange version, this no-flange design is built for applications where the bolt carrier and buffer spring don't extend past your receiver ring. It's cleaner and more compact when you're not dealing with traditional recoil systems. The straightforward design means minimal parts count and straightforward installation.
This adapter works great for building compact rifles, including AR-22 builds or systems using short-stroke piston designs that don't need inline buffer springs. Users report excellent results pairing it with SIG MPX folding stocks and similar Picatinny-mounted accessories. It's a go-to choice for anyone building a modular rifle and wants more stock options without switching everything out.
No, this adapter is designed specifically for platforms where the bolt carrier and buffer spring don't require an inline tube and don't protrude past the receiver ring. Standard AR-15s with direct impingement systems need a traditional buffer tube setup. Check your upper receiver design first to make sure it's compatible with buffer-less configurations.
The flange version includes a retaining lip that captures the rear takedown pin detent spring, making it work with traditional AR-15 lower receivers. The no-flange version is more compact and designed for uppers that don't extend into that area. Use the no-flange version when the bolt carrier doesn't protrude past the receiver ring.
Installation is straightforward. The externally-threaded adapter plug screws into your threaded buffer socket, the Picatinny rail section slides into the adapter plug, and you secure everything with a hex-socket bolt and lock washer. Most people can handle it without professional help.
Any stock or brace designed with an M1913 Picatinny interface will work. Popular choices include SIG MPX folding stocks, SB Tactical braces, and similar 1913-mounted accessories. As long as the stock or brace has the Picatinny rail interface, it's compatible.
| UPC | 853906008430 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | AR-MCX Adapter w-o Flange |
| Product Type | Adaptor |
| Color | Black |
| Model |
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