LSS Chassis System

Availability: In stock

Replace your stock on your Tikka T3, Remington 700 or one of many other bolt action rifles with our tactical chassis!

Our LSS Chassis was designed for use with short barrelled bolt action rifles. It converts your rifle to an external box magazine fed rifle, while improving accuracy, and giving the rifle superior ergonomics by allowing use of AR-15 butt-stocks and grips.


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From: CA$399.99
Product Description


LSS V-shaped beddingCut view of chassis showing flat spots where the action touches the chassis.

Our LSS chassis system was designed to be as compact as possible. The V-shaped bedding and free floated forend improve accuracy and ergonomics. The forend allows for barrel contours up to 1" in diameter. The graphic on the right shows the two flat spots (V-block) where the action sits. The area below the action remains rounded for ultimate strength.

The chassis system is manufactured out of billet 6061-T6 aluminum and has been finished with Cerakote™ in Black or Flat Dark Earth (FDE).

To keep this chassis system compact, it was designed for collapsible AR-15 buttstocks. However, fixed buttstocks can mount with the use of a fixed stock adapter.
Alternatively, our LSS-XL chassis has a 3" longer forend has was designed to accept fixed buttstocks without the use of the adapter.


Recoil lug area allows for thicker lugs.

The MDT LSS chassis system is currently manufactured for the following bolt action rifle platforms:

  • Remington 700 Short Action
  • Remington 700 Long Action
  • Remington Model 7
  • Remington Model 783
  • Savage Short Action, Models 10, 11, 12 and 16
  • Savage Long Action, Models 110, 111, 112 and 116
  • Savage Axis - Short Calibers
  • Tikka T3 - Short Calibers
  • Tikka T3 - Long Calibers. Requires MDT 3.56 Magazine.
  • Mossberg MVP 5.56 (.223) using AR-15 Magazines
  • Mossberg MVP 7.62 (.308) using AR-10 Magazines
  • Howa 1500 / Weatherby Vanguard - Short Calibers. (Only compatible with MDT Polymer magazines)
  • Howa 1500 / Weatherby Vanguard - Long Calibers. 
  • Howa 1500 Mini Action -Short Calibers. (Only compatible with the OEM Magazines)
  • Ruger M77 (Scout) Short Action
  • Ruger American - Short Action

Please note important action specific information at the bottom of this page.

Mounting and Compatible Accessories

The LSS chassis is 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 chassis uses AICS style external box style magazines in .223 and .308 caliber for Short Action and .300WM or .338LM AICS style magazines for Long Action rifles, and supports the installation of bolt on MIL-STN-1913 accessory mounting rails. Mounting holes are spaced for Magpul style L5 (11 slots) and L3 (7 slots) rails (1.600” / 3.200”) to be used on the bottom of the forend up to 6.5" in length.

Note: Long action magazines come in 3 different lengths: 3.715", 3.775" and 3.850". Our chassis use 3.715 length magazines.

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


  • Increases accuracy by up to 21%
  • CNC Machined from 6061 aluminum
  • Cerakote Finish in Black or Flat Dark Earth
  • Hole spacing for Magpul L5(11slot) and L3(7slot)Rails
  • Designed for Collapsible 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, (Long Action Magazine length 3.715)
  • Weight: 1.6lb - 1.8lb

For rifles with longer barrels to be used for long range (past 900 meters) we recommend our TAC21 or our HS3 Chassis systems.

What you get, and what you need

The LSS 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. For fixed buttstocks, you will need the fixed stock adapter, or consider using our LSS-XL chassis.
  • A buffer tube for your buttstock. (Both mil-spec and commercial work on our chassis)
  • An AR-15 Pistol Grip. Ideally without a beavertail, or use a soft (bendable) beavertail.
  • At least one magazine

If you prefer a longer forend, please also see our LSS-XL chassis System or our HS3 Chassis System.

Important Notes

Howa 1500 / Weatherby Vanguard actions
This is the only action that we manufacture a chassis for that has a flat bottom action. For this reason, only our Polymer magazines will work. The fitting may need to be modified slightly for proper feeding.
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)

Savage Long Action in 338 Lapua Magnum
Savage Long Action Chassis systems all use 3.715" AICS magazine wells. The BA 110 in 338 Lapua Magnum uses 3.850" magazines and have recently switched to a thicker recoil lug which will not fit our chassis. We will be releasing a version of the ESS in mid-2017, which will be specifically designed around the current BA 110 in 338 Lapua Magnum. 

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

Savage Axis
The original recoil lug that comes with the rifle is required for installation into the chassis.

Ruger American 
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 this magazine Does not work with 300 Blackout

It will fit Predator and Ranch versions. Please read notes on magazines for 223/556 rifles.

Ruger Scout

Drop- in for Ruger Gunsite Scout rifles only. Will not fit older Tang safety Ruger M77. Mark II and Hawkeye short action will bolt in, but modifications to the magazines and ejector may be required. Rifles with two- stage triggers will also require modifications to the chassis.

The Ruger Gunsite Scout in 223/5.56mm requires the use of this magazine


Dimensions shown are based on Remington 700 Short Action. Note that this version shows the use of the Skeleton Rifle Stock with a fixed stock adapter. So it can be shorted significantly using a carbine (collapsible) buttstock.
If you prefer using a fixed rifle stock, take a look at our LSS-XL chassis.

Product Reviews

Customer Reviews 24 item(s)

Overall excellent, solid construction!
Although its only the chassis system, it is a very well designed one. I at least have the option to install any ar stock that i like as well as any grip i so choose. If i could chabge anything it would only be one thing. On the bottom of the foregrip, maybe they can design different size holes for rail mounts ect. These holes were a lottle too small and had to be re tapped to a larger size. For the price, if i got just one mag with it, I would be completely satisfied with the price.
Review by Ian / (Posted on 5/4/2017)
Remington 700 LH .308
Love this Chassis it was a great fit and it feels good to shoot. You won't beat the price and the quality is on point with more expensive systems. One of very few that offer a left hand option.
Review by Travis / (Posted on 3/3/2017)
Savage XP .308 LH
Running this chassis with a LH Savage Trophy Hunter XP (model 11) with the accutrigger and bottom-mounted bolt release in .308 which is an odd bird (even for Savage) to begin with. Loving the look and feel of the chassis. Nice and light. Fits really well with no mod needed.
Review by Danny@right-there / (Posted on 12/16/2016)
documentation needed
It says:
"To keep this chassis system compact, it was designed for collapsible AR-15 buttstocks, however fixed buttstocks can mounted with the use of a fixed stock adapter."

Which leads you to believe that you can use the adaptor (sold on this site) with a fixed stock (also sold on this site) and this chassis.

This is sadly not true - at least.... not without some serious work with a dremel.

I'm still rating this 5 stars across the board as the product is excellent - but there really needs to be clarification about what will/won't work with what.

Also as a side note - it would be super helpful if the parts all came with the allen keys needed to install.
Review by Michael / (Posted on 11/22/2016)
LSS Fit & Finish
Received my LSS yesterday, the quality is solid with no complaints. No problems with install on my Savage 10P-SR. Will post another review after range day results.
Review by Kyle / (Posted on 11/11/2016)
Great Upgrade
Over-all the chassis is a great new addition to my shooting platform. I feel its a better upgrade to the factory stock/chassis that really provided NO advantage to anything. This one will at-least hold up and with stand abuse as well as the new low profile and sleek look. Besides the price and having to add my own custom parts its a great Platform/Chassis!

Thanks MDT,

Review by ...P...(OHIO) / (Posted on 8/10/2016)
Not designed for pre accutrigger savage but still a great product!
I bought the LSS chassis for my .270 Savage 111 Long action Stagger feed pre accutrigger. The mag well on my action wasn't an exact match and I ended up having to mill the action on the rear part of the mag well. The magazine would not go up in the the mag well far enough to engage the mag release on the chassis because the feed lips would hit the action on the rear. I milled it out most of the way until there was still 1/16" left hanging over in to the mag well. Then with the lip hanging over the magazine feed lips would clear the action but the very back part of the magazine would hit the action just before the magazine latch on the chassis would engage. So I had to mill the lip up .075" upward to allow the magazine to go up a little more to engage the latch. If I wouldn't have left the lip there, then the magazine would have gone up to far in to the mag well (1/4" - 3/8" too far) and the bolt would hit the feed lips, and not close.

If this process is done correctly it will work as it should on the older style long action savage rifles.

The action screws were very tight as well. The recoil lug would not hardly let the action go back far enough to engage the threads on the action screws. So I had to get a longer screw for the front and start it first and then push the action down to where the recoil lug was in place. Then install the rear action screw. Then swap out the front screw with the one provided by MDT. I don't mind this though because it is a tight fit and assures me that the recoil lug is engaged and the action is tight, which will help with accuracy.

The machining quality and finish is very clean and well done on this chassis though. I haven't had a chance to fire because I'm waiting to get my milled action ceracoated so that the bare metal is protected. Then I will test fire it.

I would do it again because I love the look of the chassis and am anxious to use it.

I did call MDT about the mag well not lining up and they were very helpful and offered to gladly take the chassis back if I didn't want to take on the task of milling the action, but I was determined and had my heart set on the LSS chassis.

Hope this helps anyone else who may have a pre accutrigger savage like mine! And it sounds more complicated than it is if you take your time in milling and keep test fitting.

Review by Klinton / (Posted on 8/5/2016)
Awesome chassis; great price!
I wanted to build a 1000 yard rifle without breaking the bank: I purchased a Ruger American Predator chambered in 6.5. The biggest limfac with the Ruger was its crappy buttstock, so I purchased the MDT LSS Chassis; problem solved. The install was very easy and the fit was perfect. I also purchased the side folding fixed stock adapter which im not a big fan of. The adapter adds over an inch to the length making one of the adjustments on my PRS buttstock useless; also, it doesn't lock into place very well, but that has nothing to do with the quality and functionality of the chassis itself. The chassis is awesome and gave it the much needed rigidity to keep my glass on tgt at distances greater than 600 yards. I just purchased another MDT chassis for one of my Remington 700's.
Review by Joe / (Posted on 7/22/2016)
The price point and customization of this stock makes it stand out as a solid shooting base to begin your build without breaking the bank!!...I know have 2 of them and built one for my 300 WSM for hunting.
I recently attended the Darrel Holland shooting school and I used the LSS system with a Remington Short Action in .308. I mounted a Vortex Viper/HS MOA FFP 6-24 and a folding stock withe a MFT stock that is one of the few AR stocks that has a approximately 3 inch flat bottom without adding the extra weight of a Magpul PRS style butt stock. This was done to allow better contact with the rear support bag allowing a better follow through while shooting long range. I had added a short 5 inch rail to the bottom of the stock that allows me to attach a Harris Bi-pod with a quick detach mount. This stock allowed me to compete with $3k-$5K weapons systems and be very easy to modify and customize to my needs.
Review by Erik / (Posted on 6/28/2016)
Major upgrade to any stock Remington 700.
This Chassis is extremely lightweight without sacrificing any rigidity in the overall feel of the rifle. I use this chassis with my Remington 700 in .308 and I have not faced any feeding issues or problems getting my finger inside the trigger guard, which is something I'm typically concerned about with extremely lightweight rifles. I recently ordered the Tac21 LA and had to call customer service to confirm the chassis would fit my rifle. Typically I dread these calls because I never get the correct answer but the staff at MDT was extremely knowledgeable and the overall experience was very positive.
Review by Charles / (Posted on 4/27/2016)
Love this Chassis, Only thing i found on installation was i had to do some fabrication to my magpul grip to get it to fit, but aside from that installation was simple. and the difference in control is definitely worth the upgrade
Review by Chuck / (Posted on 4/12/2016)
I will buy another for my 300 WinMag project in the future!! LSS-XL
Bought the LSS for a Savage Hog Hunter .308 project, it made a great rifle out of a good one. Shoots 3/8" groups at 100yrds using LC brass, CCI Primers, 168SMK and Varget 43grns. Everything set to SAMI. With factory Ammo in synthetic stock it shot 3/4"-1". The MDT synthetic Mag works great!!
Review by brian / (Posted on 4/6/2016)
Excellent light weight chassis system
MDT makes a quality product that they stand behind 100%. I have taken an entry level American Predator Rifle with a LSS Chassis that can now compete with systems that cost five times as much in Precision Shooting Events! Highly recommend MDT.
Review by Mark / (Posted on 3/29/2016)
Initial Impressions.
Well, MDT has introduced it's LSS stock for the Ruger American Series rifles and I have mine here. It took about twenty minutes to get it assembled on my RARR in 223 Rem. With a fixed power 6x42mm Leupold M8 Premier Reticle Mil-dot scope, loaded ten round magazine and sling, it's exactly 9 pounds but it feels much lighter.

With the original stock, the rifle shoots 50gr Federal American Eagle HP's into .80-95" at 100 yards and my handloaded 69gr Match ammo into .60-.70" for five shots. It has killed several coyots from between 80-330 yards so far this winter.

I shot the rifle on March 21st, in 50F temps with a quartering left rear 3-7mph crosswind. The groups were just slight smaller with 50gr American Eagle HP's, 55gr Blitz King handloads over 25.5gr of Varget. My 69gr Sierra HPBTM handloaded ammo over a modest charge of WW 748 put five into half a dime sized group three times and one group was even smaller for four rounds and then I jerked a shot low left, opening that group up to .5" at 100 yards.

Clearly an small improvement in accuracy, but a huge improvement is shootability with the LSS stock.

Now the bad news, the first round will not feed from the MDT magazines if it's loaded with more than eight rounds. I'll check with MDT today for more information on why that might be. The short OAL of the rounds (all set up to feed through standard AR15 magazines) might be part of the problem.
Review by Captain Dave Funk / (Posted on 3/29/2016)
Turn a Budget Rifle Into a Competitive Rifle!
Great upgrade to my rifle. I used this on a Savage Axis factory Heavy Barrel in 243. This chassis has made a cheap budget rifle into a competitive shooter. Buy with confidence as the customer service here is awesome very much willing to answer any questions you have. ill be buying another very soon. Here is a review of the chassis on my channel take a look!
Review by The Hide / (Posted on 3/25/2016)
Very nice Chassis System, that needed some modification with aftermarket trigger
Got the Chassis at a local shot show and it looks really well made.
I use it on a tikka t3 varmint long action system.

It was not a drop in fit because i use a "bixn andy" aftermarket trigger. i had to mill out a small portion on the right side of the trigger solt. to clear the safety and also a little bit on the to to be able to enable the safety...

other than that make a very solid feel!
Will test if in 2 days but im pretty sure the already great accuracy of the tikka system will be even better with this chassis.
Review by Daniel / (Posted on 3/9/2016)
Built one for a friend
I built a savage action rifle for a friend using this chassis. Made for a lightweight and accurate rifle.
Only problem I encountered was with the installation of a timney trigger. After installing the trigger I encountered "slam fire" and after assembling and disassembling I realized the trigger assembly was contacting the rear of the trigger well. With a little minor machining with a dremel tool problem was solved.
My friend loves his rifle and claims it to be his most accurate.
Review by Galen / (Posted on 1/24/2016)
MDT LSS chassis completes the Mossberg MVP rifle!!
The AR 15 ergonomics and versatility of the LSS chassis is exactly what the Mossberg MVP rifle platform needed. It only take a few minutes to install and the action bedding is rock solid. The fit and finish of the chassis is top shelf and it transformed my MVP into a real "Professional" grade tack driver!!

Catch the full review at
Review by MechTech / (Posted on 2/3/2015)
Best stock for mvp mossberg rifle far exceeds the original stock
The quality of the product is outstanding, the ease of installation makes this conversion into a tactical rifle top notch.The company is easy to do business with and support is outstanding.
Review by Chief / (Posted on 2/3/2015)
Greatest Tikka Accessory ever made!
This stock will take your Tikka rifle to the next level of accuracy, especially if you have the heavy barrel tactical or varmint rifle! I will never part with mine, thanks MDT!
Review by Hook / (Posted on 2/3/2015)
Excellent upgrade for the Tikka T3
I'm very pleased with the LSS chassis, which is an excellent upgrade for the Tikka T3. It is one of the rare chassis available for the Tikka (most are for the Remington 700), and being Canadian-made, avoids the complexity, uncertainty, and cost of trying to import a US-made firearm accessory.

It is precisely machined and easy to install. It works well with .308/7.62x51 Accuracy International 5- and 10-round steel magazines, as well as MDT's new 10-round polymer magazines (a great upgrade from the Tikka's standard 3-round magazine).

The Tikka has a narrow receiver which can cause ejection issues if the magazine is not positioned precisely at the right height. I have had no ejection problems with the LSS chassis.

There is only space for a 6.5" bottom rail (no side rails), but that has not been a problem for me. I've installed the following accessories on the rail:

1. T-FL folding foregrip (FAB Defense): installed nearest to the magwell. This provides a very good grip for various unsupported firing positions (standing, kneeling, sitting, prone), and allows comfortable carry when stalking/patrolling.

2. Offset sling mount: installed in front of the foregrip. It allows a quick-release sling-stud mount to be installed on the left side, making for comfortable carry with a 2-point sling.

With the above 2 items, there remains 2.75" of rail space in the front for attaching other accessories (ex. bipod, flashlight, or laser).

3. T-Pod G2 bipod/foregrip (FAB Defense): installed in front of the sling mount. Can be used as a vertical foregrip, or as a short bipod (6-8" height). A bit heavy (12.5oz), and redundant as a foregrip, but easy to install, and remove if not needed. Other picatinny-mounted bipods could be used as well.

For the shoulder stock, I use a CBS collapsible stock and an ACP cheek riser, both made by CAA. This provides an 11.25 to 15.5” LOP (I use mine on the 2nd position, for a 13.5” LOP), as well as a perfect cheekweld for my 32mm scope (it has 0-1” of height adjustment).

With the scope removed and the cheek riser lowered, I can also use the Tikka's fibre-optic sights as backup (I have the Battue model).

I use a Mod 0 Gunfighter pistol grip (BCM), which provides a more natural grip for me, for various shooting positions and for stalking/patrolling.

This improves the already excellent and accurate Tikka T3 by enabling excellent ergonomics, as well as the use of 10-round magazines. A very worthwhile upgrade overall.
Review by Grodz / (Posted on 2/3/2015)
Great product.
I had to wait awhile for the Savage LSS, but it was well worth the wait. The rifle looks great and shoots even better than before. So nice to see a great "tactical " product made in Canada. Keep up the great work. How about a Chassis system for the Ruger mini 14/30?
Review by None / (Posted on 2/3/2015)
Great product!
I recently purchased the MDT LSS chassis for the Remington 700 and I'm very happy with the product. The quality of the machining is excellent and the Rem 700 system fitted nicely with no modifications needed. The slot for the recoil lug is a bit thicker than the lug on the Rem system, but keeping the system pressed backwards when mounting this caused no problem. The precision of the finished system (700 LTR .308win) turned out to be excellent. Sub MOA groups get delivered over and over it the shooter does his job well. The only negative experience I had so far is that the sling stud broke of after just a few shots with a bipod. The sling stud could have been more robust and when replaced by another stud with a proper full thickness nut the problem was solved. But to summarize it's a fantastic product to a bargain price!
Review by Magnus in Sweden / (Posted on 2/3/2015)
What an awesome product!
Have nothing but great things to say for this chassis system. Drop in fit, hardware was included, instructions were great. I looked at a lot of chassis systems / stocks for my Rem700. Chose this system for the modular approach as I like to be able to customize my rig with the components that I want. 5Stars.
Review by Mike S / (Posted on 2/3/2015)
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