MDT XTN Folding Adapter Picatinny to XTN Nitride Black 115759 BLK UPC 990482730581
Product Description
The MDT® XTN Folding Adapter (Picatinny to XTN) in Liquid-Nitride Black (SKU: 115759-BLK / UPC: 990482730581) bridges the gap between modern vertical 1913 rail-interface chassis systems and MDT's proprietary high-performance XTN buttstock family. Engineered specifically for precision rifle competitors, backcountry hunters, and tactical operators, this rugged folding hinge drastically reduces overall rifle length for transport in compact drag bags, Pelican cases, and vehicle cabs. Rather than forcing shooters to compromise on precision rifle ergonomics when running a compact setup, this adapter provides an ultra-rigid, rock-solid lockup that ensures your cheek weld, eye relief, and length of pull return to the exact same point shot after shot.
Forged and CNC-machined from high-tensile A36 cold-rolled steel, the adapter body provides vastly superior structural durability compared to standard lightweight aluminum folding mechanisms that wear down, develop rattle, or shear under dynamic barricade stress. The entire steel structure is treated with a specialized black liquid-nitride conversion finish, delivering exceptional case hardness, lubricity, and impervious resistance against humidity, bore solvents, and abrasive dust. Internal stainless steel hardware and heavy-duty pivot pins ensure smooth, bind-free articulation through thousands of stow-and-deploy cycles without galling or material fatigue.
Built with intelligent adaptability, the MDT XTN Folding Adapter features a full 180-degree swing arc that draws the buttstock flush against the side of the action to eliminate snag points during carry. A single-button quick-release mechanism allows rapid, one-handed deployment, while the ambidextrous reversible architecture lets shooters configure the hinge to swing to either the left or right side of the rifle to avoid interfering with the bolt handle. An integrated user-adjustable folder retention screw allows armorers to calibrate hinge tension to absolute zero lash, eliminating play and maintaining match-grade structural rigidity.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Attaches directly to any rear vertical MIL-STD-1913 Picatinny rail interface on precision chassis or rifle receivers (MDT LSS Gen3 with 1913 interface, SIG Cross, SIG MCX/MPX, BRN-180, Brownells, and tactical bolt actions). The rear interface accepts MDT XTN buttstocks (Stalker CORE, SRS-X Elite, SRS-X Lite, and SRS-XF). CRITICAL: This adapter is NOT for chassis featuring female XTN receiver sockets (use MPN 115760-BLK for XTN-to-XTN). Does NOT accept standard AR-15 buffer tubes directly without an additional XTN-to-Carbine adapter. Adds 1.14 inches to overall length of pull (LOP). Torque Picatinny rail clamping bolt to 45-50 in-lbs; apply Blue Loctite® 242/243 to the buttstock attachment screw.
- Confirm the host rifle is completely unloaded, magazine detached, bolt physically open and clear, and all live ammunition removed from the maintenance area.
- Determine desired folding orientation (left-folding for right-hand bolt operation, or right-folding); if reversing hinge swing, disassemble the reversible central hinge hardware per MDT armorer specifications and reassemble in the mirrored configuration.
- Slide the Picatinny clamp base onto the host chassis rear 1913 rail section, align the cross-bolt through a rail slot, and torque the clamping screw to 45-50 in-lbs using a calibrated torque wrench.
- Insert the MDT XTN buttstock mounting lug into the female rear socket of the adapter, apply medium-strength blue threadlocker to the stock fastener, and torque to 40 in-lbs.
- Depress the single push-button release, cycle the stock through its 180-degree arc, lock it back into battery, and fine-tune the internal tension screw until zero mechanical play exists across the hinge lockup.
Key Features
- Picatinny to XTN Adaptation: Converts standard rear MIL-STD-1913 Picatinny rails to accept MDT's proprietary XTN buttstock lineup.
- A36 Cold-Rolled Steel Body: Solid steel construction provides unyielding rigidity, zero flex under heavy recoil, and extreme barricade impact resistance.
- Black Liquid-Nitride Finish: Advanced salt-bath QPQ nitrocarburizing protects against abrasive field wear, corrosion, and chemical exposure.
- Single-Button 180-Degree Hinge: Intuitive button release allows rapid stowing and instant locked deployment flush against the rifle chassis.
- Adjustable Lockup Retention: Integrated tuning screw allows armorers to dial out mechanical hinge play for permanent zero-tolerance lockup.
- Fully Ambidextrous Configuration: Reversible internal hinge mechanism can be assembled to fold to either the left or right side of the receiver.
Product Specifications
- Brand: MDT® (Modular Driven Technologies)
- Model/Series: XTN Folding Adapter (Single Hinge)
- Interface Conversion: Picatinny (1913 Rail) to MDT XTN Interface
- MPN / SKU: 115759-BLK
- Distributor SKU: 115759-BLK-MDT / MDT115759-BLK
- UPC: 990482730581
- Chassis Metallurgy: A36 Cold-Rolled Steel
- Hardware Metallurgy: Stainless Steel with Black Oxide Finish
- Surface Finish: Black Liquid-Nitride (Melonite / QPQ)
- Dimensions: 1.95 in L x 1.25 in W x 1.30 in H (49.5 mm x 31.8 mm x 33.0 mm)
- Added Length of Pull (LOP): +1.14 in (29.0 mm)
- Net Weight: 7.2 oz (204.1 g)
- Clamping Torque Specification: 45 - 50 in-lbs (Picatinny Clamp)
- Platform Compatibility: Rear 1913 Picatinny Chassis / MDT XTN Buttstocks (Stalker CORE, SRS-X, etc.)
- Country of Origin: Canada / United States
