MDT LSS-22 Chassis for Rimfire Bolt Action Rifles
MDT LSS-22 Chassis for Rimfire Bolt Action Rifles


The Modular Driven Technologies MDT LSS-22 Chassis System for .22LR caliber rifles is lightweight and compact, and adopts the same footprint as the centerfire MDT LSS Chassis. You will notice a significant improvement in accuracy due to the V-shaped bedding and free floated fore-end, which allows for barrel contours up to 1″ in diameter.

The LSS-22 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, MDT has designed designed the rifle chassis to take collapsible AR-15 buttstocks. Fixed buttstocks can also be mounted with the use of a fixed stock adapter.

The LSS-22 uses your factory magazine and each chassis is compatible with all factory barrel contours.

Because we have lowered the buttstock interface, The Savage Mark II, CZ 455 and Ruger American are able to use iron sights with this chassis. If you are using a scope, we recommend a stock with a cheek riser. Visit Modular Driven Technologies

MDT LSS 22 Chassis System Compatibility

The MDT LSS-22 chassis system is currently manufactured for the following bolt action rifle platforms:

  • Ruger American
  • CZ 455
  • Browning T-Bolt
  • Savage Mark II
  • Anschutz Match 54 – compatible only with models 1710 and 1712
  • Anschutz Match 64 – compatible only with models 1416 and 1417

The LSS-22 will not fit 17 HMR or 22 WMR versions. Updates to accommodate magnum rifles are planned for late-2017.
The LSS-22 will fit all factory heavy barrels.

Important Notes

  • The Ruger American requires the two OEM fixing components in addition to the magazine
  • The Browning T-Bolt requires the OEM magazine holder in addition to the magazine
  • The Savage Mark II, CZ 455 and Ruger American are able to use iron sights.

Mounting and Compatible Accessories

The LSS-22 chassis is designed to accept any AR-15 buttstock and pistol grip (purchased separately), and allows for customization with a wide variety of accessories. 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 fore-end.

MDT LSS 22 Chassis System Specifications

  • Up to 21% increase in accuracy
  • CNC Machined from 6061 aluminum
  • Cerakote Finish (in Black or Flat Dark Earth)
  • Hole spacing for Magpul L5 (11 slot) and L3 (7 slot) rails
  • Designed for collapsible AR-15 buttstocks
  • Accepts AR-15 pistol grips
  • Lightweight, free-floating modular fore-end
  • Accommodates barrels up to 1″ diameter.
  • Length of pull of 11.5”-14.75” (based off Hogue stock)
  • Compatible with OEM Magazines
  • Weight: 1.6lb – 1.8lb


The LSS-22 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 install this chassis on your rifle, here are some additional items you will need to purchase:

  • Any AR-15 buttstock. For fixed buttstocks, you will need the fixed stock adapter. We have also designed the Skeleton Carbine Stock for our LSS chassis.
  • A buffer tube for your buttstock (both mil-spec and commercial work with our chassis)
  • An AR-15 pistol grip. Ideally without a beavertail, or with a soft (bendable) beavertail
  • Your original factory magazine

MDT LSS 22 Chassis System Installation Videos:

For installation of Browning T-Bolt click here
For installation of CZ- 455 click here
For installation of Anschutz 54 click here
For installation of Anschutz 64 click here
For installation of Savage Mark II click here
For installation of Ruger American click here

MDT LSS 22 Chassis System Dimensions

Note that the version shown uses the Skeleton Rifle Stock with a fixed stock adapter. It can be shortened significantly using a carbine (collapsible) buttstock.

MDT LSS 22 Chassis Dimensions

MDT LSS 22 Chassis Dimensions

MDT TAC21 Price