Impact Shooting: Building an LSS Gen3 Competition Rig

The LSS GEN3 is MDT’s most modular and customizable chassis yet. The range of configurations is extensive. From the Remington 700 SA to the CZ 457 footprints, there are many options. You can make it into a lightweight tactical rig or set it up for your next PRS match—it’s really your choice. In a recent video, Pieter Malan of Impact Shooting guides us through setting up the LSS Gen3 for competition.

BREAKING DOWN THE LSS GEN 3 SYSTEM

Right from the start, Pieter explains that installing a chassis can seem intimidating, especially for first-time builders. However, the MDT LSS Gen 3 is designed to simplify the process with its modular layout. The system is built around several key components: the main chassis body, a rear interface extension that accepts various buttstocks, and interchangeable forend options depending on how the rifle will be used.

In this video, Pieter is assembling a competition rig with a longer forend designed to support ARCA accessories and improve stability during match stages. MDT even includes the necessary tools in the box—a small but thoughtful addition that makes the process easier for shooters who might not have a full set of gunsmithing tools.

STEP-BY-STEP CHASSIS ASSEMBLY

Before installing the barreled action, the chassis is assembled. The rear interface extension is first attached to the main chassis body, allowing the buttstock to be mounted. Throughout the process, Pieter points out several design improvements, including relief cuts that make it easier to access certain screws with tools. Small details like action screw keepers are also highlighted, helping prevent screws from being lost when switching between different chassis systems (thank you, MDT, for this).

Pieter then moves to the competition forend. The standard polymer housing is removed from the base and replaced with a longer aluminum forend, providing more mounting space and greater rigidity. He notes that the chassis can be configured differently depending on the rifle's intended role, whether that’s a compact setup or a full competition rig.

INSTALLING THE RIFLE AND FINAL SETUP

Once the chassis is assembled, the rifle’s barreled action is installed. This step highlights one of the main benefits of modern chassis systems: simplicity. Unlike traditional stocks, the LSS Gen 3 doesn't need bedding. The action just drops into the chassis and is properly torqued with the included action screws.

After tightening the screws to about 65 inch-pounds and confirming the action is properly seated, Pieter performs a quick function check to ensure everything works as expected. With the core installation finished, the final steps involve mounting an optic and attaching accessories.

The integrated ARCA rail allows quick attachment of bipods, tripods, and other shooting supports, making the rifle easy to configure for different shooting environments.

PREPARING FOR THE RANGE

With the build complete, the rifle is ready for its first outing. Pieter installs an optic and starts preparing for an upcoming precision rifle match. Final adjustments—such as leveling the optic, checking eye relief, and choosing an appropriate muzzle device—will be made before heading to the range.

FINAL THOUGHTS

The video functions as both a walkthrough and a demonstration of how modern chassis systems like the MDT LSS Gen 3 make rifle customization more accessible than ever. What once required specialized tools and professional gunsmithing can now be done on a workbench in minutes, allowing shooters to quickly adapt their rifles for competition, hunting, or recreational shooting

For more of Pieter, check out his YouTube channel, Impact Shooting, here.