MDT LSS Gen3 Tactical Chassis System, Ruger M77 SA

• Modular LSS Gen3 platform: The action-mating chassis base works with interchangeable forends and buttstock interfaces, giving the rifle a more adaptable layout for tactical use and future configuration changes.
• AICS magazine compatibility: Support for AICS-pattern magazines makes reloads straightforward and gives the Ruger M77 short action access to a widely used detachable box magazine format.
• AR-15 grip and carbine interface: Compatibility with AR-style grips and a carbine buttstock interface helps tailor grip angle, length of pull, and rear-end setup to the shooter and the role of the rifle.
• M-Lok tactical forend: The 348.00 mm forend provides practical mounting space for bipods, barricade accessories, and other mission-specific equipment without adding unnecessary bulk.
• Aluminium chassis construction: The rigid aluminium body supports consistent action bedding and field durability while keeping the system suitable for hard use on a tactical bolt-action rifle.

About the MDT LSS Series

The MDT LSS series is built around a compact chassis concept that gives bolt-action rifles a more modular foundation than a conventional stock. MDT introduced the LSS Gen3 in 2025 as a system with an action-specific chassis core and interchangeable components, allowing the same platform to be configured for competition, hunting, tactical applications, and general shooting. That flexibility is central to the series: the handguard and buttstock interface can be changed to suit the rifle’s role without changing the action fit.

A defining trait of the series is its use of interchangeable forends and a layout that accepts AR-style grips, giving shooters access to familiar ergonomics and a wide range of accessory options. MDT also designed the platform with an ambidextrous magazine latch, which supports practical handling from either shoulder and simplifies magazine changes in positional shooting. In use, the LSS Gen3 series is aimed at shooters who want a chassis that can start as a straightforward build and later be adapted with different furniture and support equipment, while keeping the rifle’s zero undisturbed when external chassis components are changed.

About the MDT LSS Gen3 Tactical Chassis System, Ruger M77 SA

The MDT LSS Gen3 Tactical Chassis System for the Ruger M77 short action is configured for shooters who want a more modular and support-ready rifle than the factory stock provides. Its tactical application focus is reflected in the fixed chassis layout, the M-Lok forend, and the carbine rear interface, all of which make it easier to set up the rifle for bipod work, supported positions, and accessory-driven use. For a Ruger M77 SA build, that means a more adaptable platform for precision-oriented field shooting, training, or range work.

The chassis uses an aluminium construction to provide the stiffness expected from a bolt-action chassis system, helping the action sit in a stable structure that is better suited to repeatable performance than a more flexible stock design. The 348.00 mm M-Lok forend gives useful space for mounting accessories while keeping the front end straightforward and practical. With a maximum barrel diameter of 31.75 mm, the chassis also accommodates heavier barrel profiles often chosen for rifles that are shot from support or in longer strings.

Ergonomically, this model benefits from AICS magazine compatibility, which opens the door to a common detachable magazine pattern, and from AR-15 style grip compatibility, allowing the shooter to choose grip shape and angle to match shooting position and preference. The carbine buttstock interface adds the same practical flexibility at the rear of the rifle, making it easier to tailor the final setup around balance, cheek support, and overall handling. At 1950.00 g and 851.00 mm in length, it is a substantial fixed chassis intended for stability and equipment compatibility rather than minimum carry weight.

About MDT

MDT Sporting Goods was established in 2009 in Chilliwack, British Columbia, Canada, and remains based in British Columbia. The company focuses on equipment for target shooting and hunting, with a product range that includes rifle chassis systems, buttstocks, magazines, bipods, scope bases, and scope rings. MDT identifies the TAC21 as its first chassis, which reflects how central chassis design has been to the brand from the beginning.

MDT’s reputation in this category is closely tied to its emphasis on practical rifle interface design and on product development shaped by input from competitive precision shooters. That background is especially relevant to chassis systems such as the LSS Gen3, where modularity, magazine handling, and shooting ergonomics matter as much as raw strength. Alongside chassis products, MDT also produces scope bases machined from 6061-T6 aluminum to MIL-STD-1913 and STANAG 4694 specifications, underlining the company’s focus on precision rifle hardware.

Main Features

• Manufacturer: MDT
• Chassis Series: MDT LSS
• Made in: Canada
• In production since: 2025
• Material: Aluminium
• Weight: 1950.00 g
• Length: 851.00 mm
• Forend length: 348.00 mm
• Forend type: M-Lok
• Buttstock interface: Carbine Interface
• Maximum barrel diameter: 31.75 mm
• Foldable: No
• Application: Tactical
• Magazine compatibility: AICS Magazine Compatible
• Grip compatibility: AR-15 Style Grips

Warranty

MDT provides a 2-year warranty for this chassis system. This stated warranty period adds clear manufacturer-backed coverage in addition to the product’s intended use as a hard-use rifle chassis.