Desert Tech WLVRN
Multi-caliber bullpup successor to the MDRx, launched January 2024.
The Desert Tech WLVRN (pronounced "Wolverine") is a multi-caliber bullpup rifle that succeeds the MDR and MDRx. It debuted at the 2024 Shot Show in Las Vegas, after Desert Tech publicly acknowledged several limitations of the MDRx platform a few weeks prior.
The rifle initially came in three colors: Black, Flat Dark Earth (FDE), and Tungsten. It supports multiple calibers through different configurations, including .223 Remington, .308 Winchester, .300 AAC Blackout, and 6.5mm Creedmoor. Barrel lengths range from short-barreled rifle (SBR) lengths under 16 inches up to 20 inches, depending on the caliber. A quick-change feature allows easy swapping between intermediate cartridges (like 5.56×45mm NATO) and full-power rifle cartridges (like 7.62×51mm NATO). The Colt CM901 was an earlier design that could also accept different cartridge categories on the same platform with a conversion kit.
The WLVRN is a gas-operated, semi-automatic bullpup with a conventional rotary bolt. Its gas system uses a piston above the barrel and a six-position manual gas regulator. It shares a similar layout with the MDRx it replaced in January 2024. Specific improvements over the MDRx include a machined trunnion in the receiver to retain the barrel assembly, a new barrel and barrel extension design, replaceable feed ramps, a new bolt carrier, updated charging handles (from the 2023 MDRx updates), a redesigned magazine release, an enhanced sealing gas block without the picatinny rail, a new chassis to fill the gap left by the removed rail, and the elimination of the forward eject system, which reduces the gas needed to cycle the action. The barrel and chassis now use a three-lug clamping system (up from two lugs), increasing clamping force from 65 in-lbf to 80 in-lbf for a more rigid connection.
On April 11, 2024, the Military Arms Channel found a design defect in the receiver around the front takedown pin, causing movement between the upper and lower receivers. The channel stated this would not affect rifle performance. During a live Q&A for the MDRx, Desert Tech acknowledged the issue and said it was implementing a design change.
**Variants**
**WLVRN Micron** On January 19, 2024, Desert Tech announced a standalone conversion kit called the "MICRON" for the WLVRN. It features an extremely short handguard to minimize overall length.
Quick Facts
- Origin
- United States
- Is Ranged
- yes
- Designer
- Desert Tech
- Unit Cost
- $2499 (January 2024 for 5.56)
- Production Date
- 2024–present
- Weight
- 3.37 kg .223 16" / 3.52 kg .223 20" / 3.32 kg .308 16" / 3.46 kg .308 20" / 3.46 kg 6.5 20" / 3.42 kg 300blk 16"
- Length
- 660 mm 16" / 762 mm 20"
- Part Length
- 406 mm / 508 mm
- Height
- 199.64 mm
- Cartridge
- .223 Remington / 5.56×45mm NATO / .223 Wylde / .300 BLK / .308 Win / 7.62×51mm NATO / 6.5mm Creedmoor
- Action
- Short-stroke gas-operated piston, rotating bolt
- Rate
- 675 rounds/min
Facts from the source article.
Lore & Background
The WLVRN was introduced in January 2024 as the direct replacement for the Desert Tech MDRx. Its design incorporates several improvements over the MDRx, including a machined trunnion for retaining the barrel assembly, a new barrel and barrel extension design, replaceable feed-ramps, a new bolt carrier, updated charging handles, a new magazine release system, an enhanced sealing gas block with the Picatinny rail removed, a new chassis filling the resulting gap, and the removal of the forward eject system, which reduced the gas required to cycle the action. The barrel-to-chassis clamping system was changed from 2 lugs to 3, increasing clamping force from 65 in-lbf to 80 in-lbf for greater rigidity.
On April 11, 2024, a design defect in the receiver around the front takedown pin was discovered by the Military Arms Channel, causing movement between the upper and lower receivers. The Military Arms Channel asserted this would not affect performance. During an MDRx live Q&A, Desert Tech acknowledged the problem and stated it was implementing a design change to correct the defect.
Two variants exist: the WLVRN Micron, announced on January 19, 2024, as a standalone conversion kit with an extremely short handguard to minimize overall length, requiring ATF registration as a short-barreled rifle. As of January 2026, Desert Tech began offering the Micron in .300 Blackout. The Sabertooth is a select-fire variant intended for military and law enforcement, featuring a fully automatic fire selector and other design changes; its select-fire capabilities are not interchangeable with the WLVRN, making it a separate firearm for ATF compliance.
Reader's Guide
The Desert Tech WLVRN represents a direct evolution of the MDRx platform, addressing limitations that Desert Tech publicly acknowledged for the first time shortly before its debut. Its multi-caliber quick-change feature allows swapping between intermediate cartridges like 5.56×45mm NATO and full-powered cartridges like 7.62×51mm NATO, a capability seen in earlier designs such as the Colt CM901. The WLVRN's design changes—such as the machined trunnion, three-lug barrel clamp, and removal of the forward eject system—were aimed at improving reliability and rigidity. The discovery of a receiver defect shortly after launch, acknowledged by the company, highlights the iterative nature of the platform's development. The Micron and Sabertooth variants extend the rifle's utility for short-barreled and select-fire applications, respectively, though the Sabertooth is legally distinct to comply with ATF regulations. The WLVRN's place in the bullpup rifle market is defined by its modularity and direct lineage from the MDR series.
Did You Know?
- The WLVRN is pronounced 'Wolverine'.
- It was first showcased at the 2024 Shot Show in Las Vegas.
- The barrel clamping system uses 3 lugs at 80 in-lbf of force, up from 2 lugs at 65 in-lbf on the MDRx.
- A design defect in the receiver around the front takedown pin was discovered on April 11, 2024, by the Military Arms Channel.
More in Assault Rifles, Part 2 1-24
Spotted an error? Know more?
Reader corrections go straight into our review queue. Suggest an edit · How this site is sourced