Description
The MDT LSS Gen 3 XTN Interface is the part that lets you attach an XTN-style buttstock to the back of your LSS Gen 3 chassis. The Gen 3 platform was designed around a center body base, and from there you pick your stock interface, grip, and forend to build the rifle you want. This is that stock interface piece, cut for the XTN setup, and it drops the whole modular concept right into your hands.
One of the best parts of the Gen 3 system is that buttstocks and handguards can be hot swapped without messing with your zero, so changing your configuration doesn't cost you a trip back to the range to re-confirm. Want to go from a compact truck gun to a stretched-out long range rig? Pull the old interface, bolt this one on, and you're back in business. The whole thing takes minutes with the included hardware.
What the XTN Interface Brings to Your LSS Gen 3
This piece is machined from 6061 aluminum and finished in black Cerakote, which keeps it tough and corrosion resistant while matching the rest of a black chassis build. It provides a stable, repeatable mounting point for your XTN buttstock, and the LSS Gen 3 is also set up to accept standard AR-style grips, so you're not locked into a proprietary ecosystem for the rest of your ergonomics.
Building It Your Way
The LSS Gen 3 is offered as a modular format on purpose. You start with the base, add your stock interface, then pick from competition, hunting, or tactical forends to finish the job. That layout means you can dial the rifle in for PRS matches, backcountry hunts, or a compact tactical build without ever pulling the barreled action. If you're already running a Gen 3 chassis and want to switch to or add an XTN back end, this is the exact part you're after.
Key Specifications
- Manufacturer: MDT
- Model: LSS Gen 3
- Manufacturer Part Number: 110085-BLK
- UPC: 990482710453
- Interface Type: XTN Buttstock Interface
- Material: 6061 Aluminum
- Finish: Cerakote
- Color: Black
- Product Type: Chassis Interface / Accessory
- Compatibility: MDT LSS Gen 3 Chassis
- Grip Compatibility: AR-style grips
What’s Included
- MDT LSS Gen 3 XTN Buttstock Interface (Black)
- Installation hardware
Frequently Asked Questions
What does the MDT LSS Gen 3 XTN Interface actually do?
It's the buttstock interface piece that lets you run an XTN-style stock on the back of your LSS Gen 3 chassis. The Gen 3 is built as a modular system where you pick your stock interface, grip, and forend separately, and this covers the XTN option. It gives you a solid mounting point so you can swap the rear of the rifle without pulling the barreled action.
Will swapping to this interface mess up my rifle's zero?
No. MDT designed the LSS Gen 3 so buttstocks and handguards can be hot swapped without affecting zero. Changing the back end of the rifle won't send you back to the range to re-confirm, which is one of the biggest perks of the platform.
Do I need anything else to install the XTN Interface?
The interface ships with all the necessary installation hardware, so you can bolt it on with basic tools. Keep in mind this is the stock interface only, so you'll still need an XTN-style buttstock and an existing LSS Gen 3 chassis base to attach it to.
What is the XTN Interface made of and how tough is it?
It's machined from 6061 aluminum and finished in black Cerakote. That combination gives you a durable, corrosion-resistant part that holds up to field use and matches the look of a black chassis build.






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