Description
MDT built this folding adapter for chassis shooters who want a rifle that shrinks down for the truck, the pack, or the safe without turning into a rattle-trap. It fits most bolt-action chassis rifles running an AR-style buttstock interface, and the standout here is the 2-way lock. That means the mechanism locks rigid when the stock is extended for shooting, then locks again once you swing it closed so nothing swings loose while you move.
How the 2-Way Lock Sets This MDT Adapter Apart
A lot of folders only lock in the open position and let the stock hang free when folded. The 2-way system solves that by giving you a positive detent on both ends. Extended, you get straight-line integrity so your point of aim stays honest under recoil. Folded, the stock stays pinned tight against the receiver, which keeps your overall package compact and quiet whether it's slung on your back or riding in a case.
Getting the Carbine to Carbine Interface Right
This is the Carbine to Carbine version, which MDT identifies by the circular stock interface on both the chassis side and the buttstock side. If your chassis and stock both use that round interface, this is your match. Worth knowing before you order: the adapter has a solid interface and will not let a bolt pass through, so it works on bolt guns and not on setups that need the bolt carrier to travel back into the buttstock. It also adds 1.75 inches to your length of pull, which is real and worth accounting for if you already run a longer LOP.
Real-World Fit for the MDT Folding Adapter
Users running this on chassis platforms like XLR and similar setups report it locks up tight and does exactly what a folder should. It's a straightforward way to make a heavy precision rig easier to store and haul without giving up the rigidity that makes those rifles shoot. Note that it is not compatible with MDT's TAC21, ESS, or ACC chassis, since those have their own dedicated folding solutions.
Key Specifications
- Manufacturer: MDT
- Manufacturer Part Number: 103409-BLK
- UPC: 709951107263
- Model: 2-Way Locking Folding Stock Adapter
- Interface: Carbine to Carbine (circular)
- Locking Configuration: 2-Way (locks extended and folded)
- Length of Pull Added: 1.75 inches
- Color: Black
- Compatibility: Most bolt-action chassis rifles with AR-style interface
- Bolt Clearance: Solid interface, will not allow a bolt to pass through
What’s Included
- MDT 2-Way Lock Carbine to Carbine Folding Stock Adapter (Black)
Frequently Asked Questions
Will the MDT 2-Way folding adapter fit my rifle?
It's designed to work with most bolt-action chassis rifles that use an AR-style buttstock interface. This specific model is the Carbine to Carbine version, meaning both your chassis and your buttstock should use the round, circular interface. It is not compatible with MDT's TAC21, ESS, or ACC chassis, which have their own dedicated folding stock options.
What does the 2-way lock actually do?
The 2-way lock holds the stock rigid in two positions rather than one. Extended, it keeps solid straight-line integrity so your rifle shoots consistently. Folded, it locks the stock securely against the receiver so it doesn't flop around during transport or storage.
Does this folding adapter change my length of pull?
Yes. The adapter adds 1.75 inches to your length of pull once installed. If you already run a longer LOP or have a shorter frame, factor that in, since you may want to adjust your stock spacers to keep the fit comfortable.
Can I use this on an AR-15 or a semi-auto?
No. This adapter has a solid interface and will not let the bolt pass through, so it's built for bolt-action rifles. A standard direct-impingement AR needs the carrier to travel back into the buffer tube to cycle, and this blocks that, so it won't work for those platforms.



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