Description
XTS 1913 Fixed Buffer Tube Adaptor 1913 Picatinny Rail to AR Buffer Tube 7075 Aluminum Construction Black XTS 1913FIXA UPC 767820118802
The XTS 1913 Fixed Buffer Tube Adapter (MPN: XTS-1913FIXA) is a precision-engineered stock interface adapter designed to attach standard AR-15 carbine buffer tubes and receiver extension stocks directly onto firearms equipped with a rear 1913 Picatinny rail interface. Precision CNC-machined from ultra-durable 7075-T6 aircraft-grade aluminum, this fixed mounting module provides a rock-solid, zero-movement connection for SIG MCX/MPX, Ruger LC Carbine, CZ Scorpion, AK adapters, and custom PCC platforms.
Featuring a hardcoat anodized black protective finish, the XTS-1913FIXA eliminates stock play and flex, ensuring a stable shoulder weld during rapid strings of fire. The rear female threading accepts all standard Mil-Spec or Commercial-spec AR-15 buffer tubes, enabling shooters to mount their preferred collapsible carbine buttstocks or stabilizing pistol braces to non-AR bufferless firearm chassis.
Engineered with dual heavy-duty steel clamping screws, the XTS-1913FIXA mounts securely to any standard rear MIL-STD-1913 Picatinny rail section without specialized tools or custom modification. Backed by XTS quality assurance, it offers a reliable, high-strength solution for modern bufferless rifle and pistol-caliber carbine builds.
Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Mounts to any rear vertical 1913 Picatinny rail endplate (SIG SAUER MCX/MPX, Ruger LC Carbine/PC Charger, CZ Scorpion EVO with 1913 endplate, AK 1913 stock adapters, B&T, and BRN-180 bufferless lower receivers). Accepts all standard 1-3/16″-16 tpi AR-15 carbine buffer tubes (Mil-Spec or Commercial). (Note: This is a FIXED adapter and does not fold; for folding applications, a side-folding hinge mechanism is required).
- Perform a complete firearm safety check: drop the magazine, lock the bolt rearward, and visually inspect the chamber to verify zero live rounds are present.
- Loosen the dual clamping screws on the side of the XTS-1913FIXA adapter using an Allen wrench.
- Slide the clamp interface downward over the rear vertical 1913 Picatinny rail section of your firearm until properly seated in the desired rail slot.
- Torque the side clamping screws evenly to manufacturer specification (25–30 in-lbs) to lock the adapter onto the rail.
- Thread your AR-15 buffer tube into the female rear threads of the adapter until hand-tight, align the buffer tube timing notch/stock indexing channel vertically, and secure with a standard castle nut and endplate if applicable.
- Install your preferred carbine buttstock or brace, performing a shoulder weld test to verify rock-solid stability.
Key Features
- 7075-T6 Aircraft-Grade Aluminum: Forged and CNC-machined from high-strength 7075 aluminum for maximum shear resistance and lightweight durability.
- 1913 Picatinny to AR Buffer Tube Conversion: Adapts rear 1913 rail sections to accept any standard AR-15 carbine receiver extension tube.
- Type III Hardcoat Anodized Black Finish: Deep-penetration matte black surface treatment protects against chemical corrosion, scratches, and wear.
- Dual Heavy-Duty Steel Rail Clamps: Twin locking screws ensure rock-solid clamping pressure against the Picatinny rail with zero wobble.
- Universal Non-AR / Bufferless Platform Mounting: Ideal for SIG MCX/MPX, CZ Scorpion, BRN-180, AK 1913 adapters, and PCC chassis.
- Direct Drop-In Installation: Mounts quickly to standard MIL-STD-1913 rail endplates without permanent weapon modification.
Product Specifications
- Brand: XTS (Xtreme Tactical Sports / DMA Inc.)
- Model/Series: 1913 Fixed Buffer Tube Adapter
- MPN / SKU: XTS-1913FIXA
- UPC: 767820118802
- Mount Type: Rear MIL-STD-1913 Picatinny Rail Clamp
- Thread Interface: Standard AR-15 Buffer Tube (1-3/16″-16 tpi)
- Platform Compatibility: Bufferless Firearms w/ Rear 1913 Rail (SIG MCX/MPX, CZ Scorpion, AK 1913 Adapters, BRN-180, PC Charger)
- Material: 7075-T6 Aircraft Aluminum Body / Steel Screws
- Finish / Color: Hardcoat Anodized Matte Black
- Mechanism Type: Fixed (Non-Folding)
- Weight: 3.2 oz
- Country of Origin: USA / Imported
