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 AR-15 buttstocks and grips, and at the same time converting it to an external box magazine fed rifle.
- Remington 700 Short Action – Fixed and Carbine Buttstocks – Shipping Nov 14
- Tikka T3 Short Action – Fixed and Carbine Buttstocks – Shipping Nov 23
- Howa 1500 Short Action – Fixed and Carbine Buttstocks – Shipping Dec 13
- Ruger American Short Action – Carbine Buttstocks – Shipping Dec 13
- Savage Short Action – Fixed and Carbine Buttstocks – Shipping December 8
- Lithgow Short Action – Carbine Buttstocks – Shipping Jan 6
- Remington 700 Long Action – Fixed and Carbine Buttstocks – Shipping December 15
- Tikka T3 Long Action – Fixed and Carbine Buttstocks – Shipping Dec 27
- Howa 1500 Long Action – Fixed and Carbine Buttstocks – Shipping Dec 29
- Savage Long Action – Fixed and Carbine Buttstocks – Shipping December 21
MDT LSS XL Chassis Details
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 really 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 5 sides of the forend
- Barricade-stop grooves ahead of mag-well
- Side-relieved mag well to accommodate bulging magazines
- Collapsible 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.
MDT LSS XL Gen2 Mounting and Compatible Accessories
The LSS-XL Gen2 chassis are designed to accept any AR-15 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 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.
MDT LSS XL Gen2 Chassis Specifications
- 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.
- Collapsible buttstock interface option designed for collapsible AR-15 buttstocks, including the MDT Skeleton Carbine Stock.
- Fixed buttstock interface option designed for fixed AR-15 buttstocks, optimally the MDT Skeleton Rifle Stock V5.
- Accepts most AR-15 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.
What you get, and what you need
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 AR-15 buttstock.
- A buffer tube for your buttstock. (Both milspec and commercial work on our chassis)
- An AR-15 Pistol Grip. For fixed interface chassis, a grip without a beavertail, or with a soft (bendable) beavertail must be used.
- At least one magazine
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.
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 – Long Calibers
Only our Metal 3.560 magazine will fit with the chassis for this action and needs to be purchased separately.
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. Detailed instructions are provided, and an installation video can be found here.
Ruger American in 223/5.56mm requires the use of a magazine with extended feed lips, such as this one: http://shopruger.com/556-NATO-10-Round-Magazine/productinfo/90458/. This is to prevent the round from being released before entering the chamber.
Does not work with 300 Blackout
This chassis will also accept the Predator and Ranch versions. Please read the notes above regarding magazines for 223/5.56 rifles.