Description
This is the LSS GEN3 in its Competitor build, inletted specifically for a right-hand Ruger American Long Action. It takes one of the most popular bolt guns in North America and turns it into a modular precision platform that runs AICS pattern magazines, feeds from an ambidextrous mag latch, and accepts common AR-15 style grips. The core body is CNC machined from 6061 aluminum and finished in black Cerakote, so it shrugs off field use and holds up round after round.
What Sets the LSS GEN3 Chassis Apart
The whole point of the GEN3 system is that the base body stays put while everything else swaps out. You can pull the forend, buttstock interface, or grip without ever removing the barreled action, which means your optic zero stays exactly where you left it. That is a big deal when you want to run a lightweight setup one weekend and a fully weighted competition rig the next. There is also a built-in barricade stop molded into the front of the magwell, a small touch that pays off when you are shooting off props.
Inside This Competitor Configuration
The Competitor build comes dialed for match work right out of the box. It pairs the GEN3 body with an XTN buttstock interface, the flat wide Competition Forend with an integrated ARCA rail, an Elite vertical grip, and the SRS-X Lite buttstock. That ARCA rail makes clamping into a tripod or setting up a bipod feel automatic, and the adjustable length of pull lets you tune the fit to your body and gear.
Fitting Your Ruger American Long Action
This version is cut for a right-hand Ruger American Long Action, and installation is a no-gunsmithing job. Drop in your barreled action, torque the two included action screws, and you are ready to load AICS mags. It clears up to a 1.25 inch straight diameter barrel, so most sporter and heavy profile setups have plenty of room to free float. If you already trust your Ruger and want to modernize it without starting over, this is the upgrade path that keeps growing with you.
Key Specifications
- Manufacturer: MDT
- Manufacturer Part Number: 115057BLK
- UPC: 990482726300
- Model: LSS GEN3 Competitor
- Action Fit: Ruger American Long Action, Right Hand
- Material: CNC Machined 6061 Aluminum
- Finish: Black Cerakote
- Magazine Compatibility: AICS Pattern
- Grip Compatibility: AR-15 Style Grips
- Mag Latch: Ambidextrous
- Max Barrel Diameter: 1.25 inch Straight Diameter
- Buttstock Interface: XTN
- Forend: Competition Forend with Integrated ARCA Rail
- Length of Pull: Adjustable
- Gunsmithing Required: None
What’s Included
- LSS GEN3 Chassis Body
- Trigger Guard
- XTN Buttstock Interface
- Competition Forend with Integrated ARCA Rail
- Elite Vertical Grip
- SRS-X Lite Buttstock
- 2x 1/4in-28 x 1in Socket Head Cap Action Screws
Frequently Asked Questions
Will the LSS GEN3 chassis fit my right-hand Ruger American Long Action?
Yes, this configuration is inletted specifically for the Ruger American Long Action in a right-hand pattern. You drop your barreled action into the chassis and torque it down with the two included action screws, no gunsmithing needed. Make sure you have the long action version and not the short action before ordering.
What magazines does the LSS GEN3 use?
The GEN3 chassis runs standard AICS pattern magazines. If your Ruger came with a blind or rotary magazine, dropping it into this chassis converts it to feed from detachable AICS mags. That gives you faster reloads and a wider range of capacity options.
Can I change parts on the LSS GEN3 without losing my zero?
That is the whole idea behind the GEN3 platform. The forend, buttstock interface, and grip all swap off the main body without pulling the barreled action, so your optic zero stays locked in. You can rebuild the rifle from a light hunting setup to a weighted competition rig and head straight back to the range.
How big a barrel will the LSS GEN3 Competitor clear?
The chassis is cut for barrels up to 1.25 inches in straight diameter and free floats them fully. Most sporter and heavy profile barrels will have room to spare. The Competition Forend also carries an integrated ARCA rail for tripods and bipods.





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