MDT LSS Gen3One Chassis. Three Directions. Your Build.
Start with a rigid, action-specific aluminum chassis core. Choose the forend and buttstock setup for your rifle today, then change the configuration as your shooting evolves. The LSS Gen3 is built around useful flexibility without replacing the entire chassis every time your needs change.
Choose Your LSS Gen3 Kit.
Not every LSS Gen3 needs the same forend and stock. These preconfigured directions make it easier to choose the features you'll actually use. Confirm the specific rifle inlet and included components on each listing.
The Worker
A short forend, protective side panels and compact stock arrangement for the range, farm, field or a general-purpose rifle. The approachable starting point for LSS Gen3.
The Tactical
Enclosed aluminum forend with top Picatinny mounting and M-LOK support. A natural choice when accessory placement, an adaptable stock and optic integration are priorities.
The Competitor
A wide, flat competition forend with integrated ARCA and a precision-oriented buttstock. Built for shooters who want tripod, bipod and barricade control right away.
Base. Forend. Buttstock.
Prefer choosing every part? LSS Gen3 uses a modular center section with separately selectable forends and buttstock interfaces. A chassis base by itself is not the same as a fully assembled kit.
Choose the Inlet
Select the LSS Gen3 center section built for your action, action length and handedness. This is the foundation that holds your barreled action.
Browse Chassis Bases →Pick Your Forend
Compact Worker, enclosed Tactical, flat Competition or lightweight Hunting options. Each changes how the rifle carries and mounts accessories.
Browse Gen3 Forends →Finish the Rear
Choose the correct buttstock adapter and compatible stock. Add a grip, length-of-pull fit and any rear support accessories that match your build.
Browse Gen3 Buttstock Parts →Four Ways to Set Up the Forend.
Choose a forend for the work you actually do. Component lengths and weights below describe the forend, not the complete chassis or barreled rifle.
Worker / Compact
A short 5.6-inch forend with protective side panels. Keeps the rifle trim while leaving room for selected accessories.
Find Worker Parts →Tactical / Enclosed
13.7-inch aluminum partial or full top-rail options, plus a shorter 7.4-inch version. Built for Picatinny-mounted devices and M-LOK accessories.
Find Tactical Forends →Competition / ARCA
14.32-inch aluminum forend, 14.7 oz, with a broad flat profile, integrated ARCA and mounting for weights and compatible bridges.
Find Competition Forends →Hunting / Carbon
Carbon fiber enclosed forend, listed at 5.9 oz, with M-LOK locations and a lightweight carry-focused design.
Find Hunting Forends →Keep the Core. Change the Setup.
One of the LSS Gen3's most useful advantages is the ability to change compatible forends and rear interfaces without removing the barreled action. Go from a compact field setup to a longer ARCA-equipped competition rifle by swapping components rather than starting over.
Forends & ARCA
Change the front end for competition support, lighter carry, or an enclosed Picatinny rail setup.
Shop Forends →Adapters & Stocks
Choose a compatible XTN, carbine or Picatinny rear interface, then the buttstock that fits it.
Shop Stock Components →Grips & Controls
The AR-style grip interface makes hand position easy to personalize. Add compatible thumb shelves and controls.
Shop Grips →Shop LSS Gen3 by Inlet.
The modular front and rear components start with an action-specific chassis center. Select your action before choosing a configuration.
LSS Gen3 Specifications.
The LSS Gen3 is a system of interchangeable components, so total dimensions and weight depend on the selected kit, forend and stock.
Confirm action fit, rear interface, magazine type and oversized barrel contours with MDT before ordering. Component weights and barrel clearance vary by forend.
Finish the Build.
The chassis is only the foundation. A well-matched barrel, glass, support system, magazines and grip make the LSS Gen3 into the rifle you actually want to shoot.
Rifle Barrels
Explore Lilja, Shaw and other available barrel options matched to your action, chambering and desired contour.
Shop Rifle Barrels →Scopes & Optics
Choose glass that suits your field, training or match rifle instead of treating optics as an afterthought.
Shop Rifle Optics →Rings & Scope Bases
Match rail height and ring clearance to your optic, action and selected Gen3 forend.
Shop Optic Mounts →Grips & Controls
Swap the AR-style grip and explore MDT grip and thumb-shelf options for your preferred position.
Shop Grips →AICS & Rimfire Mags
Pick the correct magazine format for the exact action and caliber, including factory rimfire mags where needed.
Shop Magazines →Bipods
GRND-POD and Ckye-Pod options for a field, bench or competition build; choose the compatible mount.
Shop Bipods →Rifle Triggers
Pair the chassis with a trigger suited to your action and the way you intend to shoot.
Shop Triggers →Shooting Bags
Rear bags, barricade bags and support gear for steady shots from real-world positions.
Shop Shooting Bags →ARCA Rails & Weights
Balance the rifle with compatible M-LOK weights, stops, ARCA and mounting accessories.
Shop Chassis Gear →Sling & QD Hardware
Choose compatible sling points and hardware for how you carry and support the rifle.
Browse Sling Hardware →Buttstocks & Adapters
Reconfigure the rear with the correct Gen3 interface and a compatible MDT stock.
Explore Rear Components →M-LOK Hardware
Add compatible rail sections, attachment parts and control accessories to the selected forend.
Shop M-LOK Gear →Where Does Gen3 Fit?
The LSS Gen3 suits shooters who value interchangeable components. If you would rather buy a single-purpose chassis or traditional stock, compare these MDT options before choosing.
MDT XRS
Traditional stock shape and interchangeable XRS grips, with a rigid chassis core and dedicated forend upgrades.
Compare XRS →ACC Premier Gen2
A competition-focused chassis with a purpose-built balance and adjustment system.
Compare ACC Premier →ACC Elite
MDT's flagship competition system when maximum positional performance is the main priority.
Explore ACC Elite →LSS Gen3 Questions Answered.
What is different about LSS Gen3?
Its action-specific center chassis is designed to accept interchangeable front forends and rear buttstock interfaces. You can change the rifle's configuration without removing the barreled action from the chassis.
What is the difference between Worker, Tactical and Competitor?
Worker is compact and practical, Tactical uses an enclosed top-rail forend, and Competitor uses a wide, flat ARCA-equipped forend for supported shooting. Stock and other included components depend on the specific kit.
Does a Gen3 chassis base include the whole stock and forend?
No. A base is only the starting section. Choose a complete kit or add the compatible forend, rear interface, buttstock and grip required by your build.
Can the Gen3 take an AR-style grip?
Yes. The LSS Gen3 accepts compatible AR-style grips. Grip shape is an easy way to tailor the rifle to your preferred hand position.
What is the maximum barrel diameter?
It depends on the forend. The Competition forend is rated for a 1.25-inch straight contour. Tactical and current carbon Hunting forends can accommodate a 1.25-inch tapered shank but are not intended for 1.25-inch straight barrels.
What magazines does LSS Gen3 use?
Compatible centerfire inlets use AICS-pattern magazines. Rimfire inlets, including CZ 457, use factory-pattern rimfire magazines. Match the exact inlet and cartridge.
Does switching the forend change zero?
The modular design allows compatible forend and rear-component changes without removing the barreled action, so the primary action-to-chassis interface stays undisturbed. Follow the specified installation and torque procedures.
Keep Building With Pete's Pillars.
Everything for the next stage of the rifle, not just the chassis.
All MDT Products
Browse MDT chassis, bipods, magazines, grips and accessories.
Shop MDT →Rifle Chassis
Compare MDT, KRG, XLR and the other chassis lines we carry.
Shop Rifle Chassis →Chassis Accessories
ARCA, M-LOK, weights, mounting parts and upgrade components.
Shop Accessories →Precision Barrels
Choose a barrel to fit your action and the build you have in mind.
Shop Barrels →