XLR Element 4.0 Chassis – Kitted out, ready to go!


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The Element 4.0 Magnesium is an ultra-lightweight modular hunting rifle chassis designed for the backcountry hunter.  The standalone chassis, without buttstock or grip, can weigh only 16 oz, depending on the action inlet.  When configured with a carbon fiber buttstock and carbon fiber grip, the system weight is just 28 oz.  This ultralight configuration is the first rifle chassis system in the world to weigh under 2 lbs!  Now featured with a built-in bubble level and machined in RRS 1.5″ dovetail (Arca-Swiss) in the forend.

Machined from AZ61A Magnesium, the Element 4.0 Mg retains all the strength and durability for which our rifle chassis systems are known, but at a fraction of the weight!  This is the ultimate lightweight, modular chassis platform for the backcountry outdoorsman!

Kit Details

Each Chassis is set up with the following accessories:

  • Carbon Fiber Buttstock – with a push-button folding buttstock
  • Carbon Fiber Grip
  • Adjustable Thumb Rest


Technical Specs

  • Chassis Block: 16 – 20 ounces. This can vary slightly based on the action inlet (Not including buttstock or grip). Feel free to call on specifics.
  • Chassis W/Carbon Grip & carbon Stock: 28 – 32 ounces.
  • Configured with the TR-2 Buttstock, Ergo Tactical Deluxe Grip: 2 pounds 10 ounces.
  • Material: Machined from solid AZ61A Magnesium.
  • Arca-Swiss/RSS Railing: Integrated Arca-Swiss/RSS railing into the bottom forend.
  • M-LOK Compatible: Yes, the Element 4.0 chassis system is M-LOK compatible.
  • Detachable Magazines: Yes, the Element 4.0 chassis system comes standard with an integrated detachable box magazine system (Magazine sold separately).
  • Magazine Type: The Element 4.0 chassis system Utilizes AICS pattern magazines.
  • Bedding Required: No, XLR’s multi-point radial cut inlet eliminates the need for traditional V-Block or Glass Bedding
  • Accepts AR Style flat top grips and AR-style buttstock.


  • (A) Magwell To End of Forend: 12″
  • (B) Recoil Lug To End of Forend: 10 3/4″
  • (C) Overall Chassis Block: 20 1/4″
  • (D) Overall Chassis Length: 31″
  • (E) Length Of Pull (LOP) – Fixed Short W/Folder: 14″
  • (F) Bottom Grip To Top Of Chassis Block: 6″
  • (G) Chassis Forend Width: 1.61″
  • Total weight = 29.5 oz
  • (A) Magwell To End of Forend: 11 1/4″
  • (B) Recoil Lug To End of Forend: 10″
  • (C) Overall Chassis Block: 20 1/4″ 
  • (D) Overall Chassis Length: 29 1/2″ – 32 1/2″ 
  • (E) Length Of Pull (LOP) – Fixed Long W/Folder: 15 1/4″ 
  • (F) Bottom Grip To Top Of Chassis Block: 6″
  • (G) Chassis Forend Width: 1.61″
  • Total weight = 34.5  oz 
Note: LOP can Vary +/- ½” due to trigger shoe variation. Straight VS Curved triggers will have a different LOP.
Note: (F) Bottom of grip to top of chassis block varies by grip.