KNS Compact AR/MCX Stock Adapter
Not Yet Rated | Write the First Review SKU: 222-KNS-Compact AR-MCX Adapter
MFG#: Compact AR-MCX Adapter

KNS Compact AR/MCX Stock Adapter – Minimal Footprint, Maximum Modularity

Compact. Clean. Purpose-Built for Modern Modular Firearms.

Looking to streamline your build without sacrificing performance? The KNS Compact AR/MCX Stock Adapter is the no-nonsense solution for attaching Picatinny-style stocks or braces—like the SIG MPX folding stock or SB Tactical FS1913—without the added rail length found in traditional adapter plates. It’s the perfect match for minimalist builds, pistol platforms, or any rifle that doesn’t rely on a buffer tube for mechanical function.

🔧 Key Features:

• Shortened Design – No rear rail pocket extension = a tighter, cleaner profile for compact builds.

• Picatinny Interface – Mount folding stocks or braces with confidence and stability.

• Two-Part System – Includes adapter plug, Picatinny rail insert, hex-socket bolt, and lock washer for secure installation.

• Ideal for Non-Buffer Guns – Designed specifically for builds where the carrier does not require a buffer tube to cycle.

• 💪 Built by KNS Precision – Trusted by gunsmiths and builders for rugged, innovative AR-platform accessories.

🧰 Application Examples:

• Pistol Caliber Carbines (PCCs)

• MCX-style bufferless builds

• Compact SBRs (where legally applicable)

• Tactical pistols and suppressed setups

⚠️ Important Compatibility Notes:

• ❌ Will not work with standard AR15 rifles requiring buffer systems.

• ❌ Incompatible with AR15 lower + MCX upper combinations.

• ✅ Designed for firearms where the bolt carrier group does not protrude past the receiver ring.

• 🧱 Lower receiver not included. And no, the 10/22 Charger isn’t either.

Technical Specifications:

Why Compact?

For many modern firearms, bulk is the enemy of performance. The KNS Compact Adapter removes unnecessary rail extension while still delivering rock-solid Picatinny support. Whether you’re trimming ounces or shortening length of pull, this adapter is a premium choice for lean tactical builds.