MDT LSS-XL Gen 2 Rifle Chassis System

$649.00$899.00 inc. GST

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Increase accuracy and ergonomics of your rifle with our LSS-XL Gen2 chassis system. The LSS-XL Gen2 is a longer and more feature-rich version of our LSS chassis system. The LSS-XL Gen2 has been updated with a bold, modern new look inspired by the popularity of the ESS chassis line, while maintaining and improving upon the overall aesthetic of an MDT chassis.

The LSS-XL Gen2 allows you to convert your bolt action rifle to a highly versatile rifle allowing you to adjust the ergonomics with the use of standard chassis buttstocks and grips, and at the same time converting it to an external box magazine fed rifle. Shoot Better.

The LSS-XL Gen2 comes two variants, FIXED or CARBINE depending on buttstock preference. The FIXED version will work with fixed length style buttstocks such as the MDT SRS V5, while the CARBINE version will work with collapsible (adjustable length) buttstocks as well as the non-collapsible MDT Carbine buttstocks, see below links.

Select your rifle variant from the drop down list. SA is Short Action, LA is Long Action. RH is for Right Handed, LH is for Left Handed.

NOTE: This listing is for the Chassis body ONLY. Does not come with buttstock, grip, magazine, night vision hood, or any of the other accessories in photos.


Don’t forget to check out our ATP Limbsaver Recoil Pad and Adaptor for the MDT chassis/buttstocks at the following link, one of the best upgrades you can have for shooting comfort:


Buttstocks are available here:



Grips are available here:

Magazines are available here:

M-LOK accessories are available here:



The original LSS-XL chassis system was designed as a variant of our highly popular LSS chassis. The LSS chassis was designed for use with compact, short barrelled rifles. Many customers liked the LSS chassis, but wanted to use a fixed buttstock, and get their bipod out further forward.

This prompted us to design the first-generation LSS-XL chassis system, which has a forend extended by 3″ and was designed to accept fixed rifle stocks without the need of using any adapters.

After the successful launch of our ESS chassis system, requests started pouring in for the new features that had been introduced on the ESS chassis to be rolled out on our other chassis systems. In response, we have upgraded our LSS-XL chassis line with a Gen2 lineup that incorporates the following new features:

  • Bold, modern new look
  • Ambidextrous magazine release
  • Thumbrest above trigger guard
  • Larger barrel channel to accommodate barrels up to the diameter of the action
  • M-Lok pattern attachment slots on all five sides of the forend
  • Barricade-stop grooves ahead of mag-well
  • Side-relieved mag well to accommodate bulging magazines
  • Carbine and fixed buttstock interface options

The chassis is designed with V-shaped bedding surfaces, allowing you to drop your rifle right in without the need for additional bedding. The bottom profile of the V-block cutout has been kept round and close to the action without making contact, maintaining maximum strength. The LSS-XL Gen2 chassis will free float barrels up to 1.350” diameter.


The LSS-XL Gen2 chassis are designed to accept the standard chassis type buttstock and pistol grip (purchased separately), offering the option to customize from the wide variety of  Accessories available on the market.

The LSS-XL Gen2 chassis accepts AICS-pattern external box magazines, and supports the installation of M-Lok patterned accessories along the forend.

Note: Long action magazines come in 4 different lengths: 3.560”, 3.715″, 3.775″ and 3.850″. Unless otherwise specified, our long action chassis use 3.715 length magazines.

The chassis will accept recoil lugs up to .350″ (8.9mm) thick.


  • Increases accuracy by up to 21%
  • CNC Machined from 6061 Aluminum.
  • Cerakote finish in Black or Flat Dark Earth.
  • M-Lok pattern attachment system on all 5 faces of the forend.
  • Carbine buttstock interface option designed for carbine buttstocks, including the MDT Skeleton Carbine Stock.
  • Fixed buttstock interface option designed for fixed buttstocks, optimally the MDT Skeleton Rifle Stock V5.
  • Accepts most standard chassis Pistol Grips.
  • Lightweight, free-floating modular forend.
  • Will accommodate barrels up to 1.350″ diameter.
  • Compatible with AICS style magazines.
  • Weight: 1.6lb – 2.0lb, depending on the rifle model.


The LSS-XL Gen2 chassis system comes as a 1-piece chassis, with all required mounting hardware included. This includes new action screws, and a screw for the pistol grip.

To complete this chassis on your rifle, the additional items you need to purchase are:

  • Any standard chassis buttstock.
  • A buffer tube for your buttstock. (Both mil-spec and commercial work on our chassis) NOTE: If you purchase an MDT buttstock this includes the buffer tube so you won’t need to purchase an additional one.
  • An AR15 Pistol Grip.  For fixed interface chassis, a grip without a beavertail, or with a soft (bendable) beavertail must be used.
  • At least one magazine


CZ 527 
Requires the use of OEM CZ 527 magazines as the action is too small to use AICS magazines.

Howa 1500 / Weatherby Vanguard actions
Only our polymer magazines will work in the short action rifles due to the flat bottom. The long action rifles will work with the metal 3.715″ magazines without fitting.
For .223 models the bolt stop prevents the bolt from moving back far enough to pick up the rounds.  This can easily be modified by removing the bolt stop and trimming the contact face.

Howa 1500 Mini Action
Requires the use of OEM Howa Mini action magazines as the action is too small to use AICS magazines.

Savage models 10/110 11/111 12/112 16/116

For rifles with the bolt release at the bottom, the bolt release can be engaged through the side of the chassis, using a pin or tool. (Not included)

Savage Long Action in 338 Lapua Magnum  

Savage Long Action chassis systems all use 3.715″ AICS magazine wells. The BA in 338 Lapua Magnum uses 3.850″ magazines and have recently switched to a thicker recoil lug which will not fit our chassis. The ESS has been specifically designed around the current BA 110 in 338 Lapua Magnum.

Tikka T3 / T3x – Long Action Calibers

Only our Metal 3.560 magazine will fit with the chassis for this action and needs to be purchased separately.

Ruger American

There are two chassis variants for the Ruger American, one that accepts AICS (AI) magazines, and one that accepts AR15 (AR) magazines. If you have a Ruger American Predator or Ranch AR which accepts AR style magazines then you will need the AR version.

The action screw is located directly above the magazine lever. This means that the magazine lever needs to be installed AFTER installing the action into the chassis.


Dimensions shown in photos based on Remington 700 Short Action.

*Skeleton Carbine Stock shown is the 9.75″ Version


The MDT LSS-XL Gen 2 chassis is available to fit the following actions:

  • CZ 527 (223 only) (uses OEM CZ 527 magazines)
  • Howa 1500 & Weatherby Vanguard Short Action
  • Howa 1500 & Weatherby Vanguard Long Action
  • Howa Mini Action (uses OEM Howa Mini magazines)
  • Remington 700 Short Action
  • Remington 700 Long Action
  • Ruger American (AICS Magazines) Short Action
  • Ruger American (AR15 Magazines) Short Action
  • Savage Short Action
  • Savage Long Action
  • Tikka T3 & T3x Short Action
  • Tikka T3 & T3x Long Action

ATP is an authorised Australian dealer for MDT. All MDT products bought from ATP are covered by the Australian MDT Warranty.

Weight 2.0 kg

CZ 527 .223 – RH, Howa 1500/ Vanguard LA – RH, Howa 1500/ Vanguard SA – RH, Howa Mini – RH, Lithgow LA102 SA – RH, Rem 700 LA – LH, Rem 700 LA – RH, Rem 700 SA – LH, Rem 700 SA – RH, Ruger American AI SA – RH, Ruger American AI SA -LH, Ruger American AR SA – RH, Savage LA – RH, Savage LA 3.850 – RH, Savage SA – LH, Savage SA – RH, Tikka T3 LA – RH, Tikka T3 SA – LH, Tikka T3 SA – RH, Tikka T3/T3x LA – RH, Tikka T3/T3x SA – LH, Tikka T3/T3x SA – RH

Buttstock Interface

Carbine, Fixed


Black, Flat Dark Earth


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