To me this is an unexpected product offering from Brownells, a Brownells branded MDT LSS Chassis. Brownells used to be slow to respond to firearm market trends and in my opinion this bolt action chassis finally shows some forward thinking on Brownells part. For me as i have stated before I really like partnerships between my favorite companies and Modular Driven Technologies and Brownells are two of my favorites. lastly i think the Rams head logo is a cool touch given that’s exactly the types of beasts that might see action from this chassis.

There are currently 18 models to choose from including two for the Ruger American Rifle. Colors are Black or Flat Dark Earth aka FDE

Visit the MDT LSS Page


The Brownells bolt action chassis is designed to accept carbine AR-15 buttstocks and pistol grips (purchased separately), offering the option to customize from the wide variety of Accessories available on the market.

The Brownells MDT LSS chassis uses external box style magazines in .223 and .308 caliber for Short Action and .300WM or .338LM magazines for Long Action rifles, M-LOK accessories on the forend.
Note: Long action magazines come in 3 different lengths: 3.715″, 3.775″ an 3.850″. this chassis use 3.715 length magazines.

The max thickness of recoil lug recommend is .350″ (8.9mm)


  • Increases accuracy
  • CNC Machined from 6061 Aluminum
  • Cerakote Finish in Black or Flat Dark Earth or Sniper Grey
  • M-LOK Compatible
  • Designed for carbine AR-15 buttstocks
  • Accepts most AR-15 Pistol Grips
  • Lightweight, free-floating modular forend
  • Will accommodate barrels up to 1″ diameter.
  • Compatible with AICS style magazines in .223 or .308 (SA) and 300WM, 30.06, 338LM (LA). (Long Action Magazine length 3.715)
  • Weight: 1.8lb – 2.1lb

The Brownells bolt action 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. (Carbine stocks are best suited. )
  • A buffer tube for your buttstock. (Both milspec and commercial work on our chassis)
  • An AR-15 Pistol Grip.  At least one magazine

Howa 1500 / Weatherby Vanguard actions
Only MDT polymer magazines will work in the short action. The long action rifles will work with the metal 3.715″ magazines without fitting.
For .223 models the bolt stop may be too long. This can easily be modified.

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)

Tikka T3 – Long Calibers
Only the MDT Metal 3.56 magazine will fit with the chassis for this action and needs to be purchased separately.


Whats better than a stable, accurate quality bolt action rifle that uses AR-15 or 308 AR/AR 308 magazines? I will tell you what is. The same rifle with a MDT LSS chassis. That rifle is the Mossberg MVP LC (Light Chassis). Modular Driven Technologies is soon to be a household name among rifle shooters. Mark my words.

The Mossberg MVP LC combines the accurate MVP Rifle Platform with a lightweight MDT LSS Chassis, Magpul Stock, and an optional Vortex Optics Viper HS-T Rifle Scope.

Mossberg MVP LC Features

  • The Mossberg MVP features a patented bolt design compatible with standard AR magazines (AR15, AR 308/308 AR)
  • Features the MDT LSS light chassis aluminum stock
  • Milspec Magpul CTR Adjustable LOP Stock with A-frame profile to reduce snagging for height adjustment
  • Offered with either a 16.25” (5.56mm NATO) or 18.5” (7.62mm NATO) barrel threaded with Silcencer Co Saker Trifecta Muzzle Brake (thread cap included).
  • Patented LBA adjustable trigger system
  • Oversized bolt handle
  • Picatinny rail
  • Adjustable bipod
  • Optional Vortex Viper HS-T 4x zoom and MRAD reticle (Rings included).

 Mossberg MVP® Series  AR Magazine Fed Bolt Action Rifle

The Mossberg® Varmint and Predator Rifle better known as the Mossberg MVP® started its life as a hunting rifle and proved itself time and again in the field. Accurate, dependable and always ready for more, the MVP, which accepts commonly available AR-style magazines, became an instant hit with a wide audience of hunters and shooting enthusiasts alike.

Today, the hugely popular platform offers a gun for all seasons and all shooting disciplines.

Coupling the capacity and flexibility of America’s most popular magazines with the accuracy and confidence that only a bolt-action rifle can deliver the MVP has become a near-perfect choice for every day at home, on the range or in the field.


MDT ESS Chassis Installed on a Rifle

The ESS Chassis retains the MDT proven V-block bedding system to form a solid and reliable base for the rifle action. The magazine well has been refined for easy insertion of the magazine, while reducing rattle and movement. The tab style magazine release has been replaced with a semi-flush ambidextrous paddle that can easily be activated by a weak or strong hand. The recoil lug mortise has been designed to accommodate most aftermarket recoil lugs and the trigger area will accommodate most aftermarket triggers.

MDT ESS Chassis System

MDT ESS Chassis System

A serrated barricade stop has been added to the front of the magazine well and a polymer fore-end grip at the balance point adds comfort. The wide fore-grip area combined with the octagonal profiled for-end tube offers flexible options when shooting over bags or improvised rests. Thumb shelves have been added to both side of the chassis for shooters who prefer an open grip.

MDT ESS Chassis System Grip

MDT ESS Chassis System Grip

The most significant change is the incorporation of the ESS specific butt-stock interface, rather than the traditional AR pattern interface.  This allows us to place the pistol grip in optimum relation to the trigger, while still allowing the shooter to choose from the wide variety of AR pattern pistol grips which suit their preference.

MDT ESS Chassis Stock – The MDT ESS chassis comes with it’s own butt-stock, similar to our Skeleton Rifle Stock. It is fully adjustable including lateral adjustment for the butt-pad and the cheek rest.  Cheek rest height and butt-pad length-of-pull are adjustable by thumb wheels.

MDT ESS Chassis Stock

MDT ESS Chassis Stock

MDT ESS Chassis Stock Cheek Riser

MDT ESS Chassis Stock Cheek Riser

A butt-stock with an integrated folder will be introduced soon as well as an M4 carbine buffer tube adapter by Fall 2017.

MDT ESS Fore-End – Fore-Ends are offered in 3 different lengths, 12″, 15″ and 18″, can be ordered with a full rail, partial rail, or no rail with cut-outs to allow low scope mounting. Each fore-end comes with M-Lok slots and QD flush cup mounts.

Action specific scope mounting rails which co-index with the fore-end rail are available as an accessory.

MDT ESS Chassis Mounting And Compatible Accessories

The MDT ESS chassis is designed with it’s own butt-stock for perfect ergonomics and is designed to use AR15 style pistol grips (purchased separately), and allows for customization with a wide variety of accessories. The Fore-End comes in 3 different lengths, and can be ordered with a full rail, partial rail or no rail.

MDT ESS Chassis System Rail Mounting Options

MDT ESS Chassis System Rail Mounting Options

MDT ESS Chassis System Specifications

  • Weight: Chassis: 1.6lb, Fore-end: 0.6lb – 1lb, Butt-stock: 2lb.
  • Length of Pull: 13.4″ – 14.4″ (Based on Remington 700).
  • Ambidextrous, easy reach magazine latch – can be operated with trigger finger or left hand.
  • Extra large magazine well for easy mag insertion/removal.
  • Barricade stop in front of magazine to prevent putting pressure on the magazine.
  • Angled front profile with hand grip for minute vertical adjustments and comfort/protection from the elements.
  • Thumb rests on both sides of the chassis.
  • Wide front profile for extra comfort / stability when resting on flat surfaces.
  • Stock height at comb and heel – 0.5” below bore centerline.  1.0” of riser adjustability.
  • Allows for barrel contours up to 1.300” straight taper.
  • Accepts AICS pattern magazines for both short and long action. (3.715” long action)
  • Accepts aftermarket lugs up to 0.375 thick and tapered
  • Compatible with all non-beavertail AR pattern pistol grips.  Beavertail grips will fit with minor trimming.
  • CNC machined from Aircraft grade Aluminum, and finished with H-series Cerakote.  Cheek-piece, fore-grip, and butt-pad constructed of composites.

What You Get And What You’ll Need

The ESS Chassis System comes complete with a chassis, butt stock, and a fore-end. All hardware is included. You will need Allen keys to assemble and install on your rifle.

In addition to the MDT ESS Chassis, you will need;

  • An AR-15 pattern pistol grip. Grips with a beavertail will require minor fitting.
  • An AICS pattern magazine appropriate for the rifle chambering.

MDT ESS Dimensions

MDT ESS Chassis Dimensions

MDT ESS Chassis Dimensions





MDT TAC21 Price





US Army International Sniper Competition, 2015 , FT Benning

2015 US Army International Sniper Competition

2015 US Army International Sniper Competition-Drake Savage Stalker 308 Long Range Tactical Sniper System

Drake Savage Stalker 308 Long Range Tactical Sniper System at the 2015 US Army International Sniper Competition

Ft Benning, GA, 2015 US Army International Sniper Competition


DRAKE ASSOCIATES and SAVAGE ARMS had the opportunity to provide one of the participating teams at the 2015 US Army International Sniper Competition with a new long range sniper platform – the SAVAGE STALKER 308, Drake MK12 5.56 SASS and related support equipment in cooperation with our industry partners MDT / Modular Driven Technologies, The MAKO Group/ Fab Defense.


During the week of October 19-23, 2015, Sniper Teams from across the world traveled to Fort Benning to compete in the Annual International Sniper Competition. The goal of this competition was to identify the best sniper team from a wide range of agencies and organizations that included the U.S. Military, International Militaries, and Local, State and Federal Law Enforcement.

Many teams were invited to compete in a gauntlet of rigorous physical, mental and endurance events that test the range of sniper skills that include, but are not limited to, long range marksmanship, observation, reconnaissance and reporting abilities, and abilities to move with stealth and concealment. After competing in the events the best teams were selected.

DRAKE ASSOCIATES and SAVAGE ARMS were privileged to be able to supply the SAVAGE STALKER 308 long range tactical sniper system, Drake MK12 5.56 SASS to the US Army National Guard Warrior Training Center Sniper team.

At the 2015 US Army International Sniper Competition awards ceremony at the end of the competition is was announced that the US Army NG WTC, using the Savage Stalker rifle system achieved the following outstanding and significant results:

  • Top National Guard Team
  • 2nd Place for NON-Special Operations/SOF team- Conventional Units

8th Place Overall Ranking for competition (The majority of the competition was from Special Operations Forces / SOF Units)

SAVAGE STALKER Rifles were very well received in the community! DRAKE ASSOCIATES had previously introduced the SAVAGE STALKER long range tactical rifles to other SOF units in recent deployments and at the USASOC Sniper Competition in March 2015 at Ft Bragg. Once again the SAVAGE STALKER Rifles were noticed and admired by the Special Operations Forces / SOF.

The SAVAGE STALKER long range tactical sniper rifles were proven to be lighter, more ergonomically designed and more accurate than many of the other systems that were used in the competition. This win by the US Army NG WTC was the result of intensive training and was a tribute to their dedication and “old school” work ethic. They competed against the best, most modern and well equipped Spec Ops teams and Won!

This is a big win for the US Army NG WTC, SAVAGE ARMS, DRAKE ASSOCIATES, MDT / Modular Driven Technologies, The MAKO Group/Fab Defense.

Modular Driven Technologies | MDT HS3 Chassis | Black

Modular Driven Technologies MDT HS3 Chassis Black

Modular Driven Technologies MDT HS3 Chassis Black -

Modular Driven Technologies MDT HS3 Chassis Black

Modular Driven Technologies MDT HS3 Chassis is a solid Rifle Chassis System manufactured from billet 6061-T6 Aluminum, which has been hard anodized for additional strength. The v-shaped bedding ensures maximum accuracy and repeatability. The fore end allows barrels as large as the size of the rifle action and has a total length of 15″ from the trigger. (Which is 3″ longer than our popular LSS chassis system). The chassis is designed to take any AR-15 buttstock and Pistol grip and accepts MDT polymer magazines or any AICS profile magazine. The chassis is finished with Polymer side panels for color, grip and feel.

Improve accuracy and ergonomics with the HS3 Chassis system. The HS3 Rifle Chassis is a light (2.2lb) chassis system for bolt action rifles that allows use of AR-15 buttstocks and grips to suit your needs. It is machined from 6061 aluminum, hard anodized and finished with black or FDE side panels for color, grip and feel.

MDT HS3 Fits the Following Rifle Models

  • Remington 700 Short Action
  • Remington 700 Long Action
  • Savage Short Action
  • Savage Long Action
  • Tikka T3 Short Caliber
  • Tikka T3 Long Caliber
  • Howa 1500 – Short Caliber

Modular Driven Technologies MDT HS3 Chassis Black

MDT Tac 21 For Sale-Rifle Chassis System