Desert Tech MDR

Lore & Background

The Desert Tech MDR is a gas-operated, conventional rotary bolt bullpup rifle with a gas piston located above the barrel and a 6-position manual gas regulator. It is designed to be fully ambidextrous, featuring ambidextrous forward and side eject ports, a viewing window for tool-free forward ejector side change, non-reciprocating ambidextrous charging handles on both sides, and two- or three-position safety/selector levers and magazine releases on both sides of the pistol grip. The outer shell is made from impact-resistant polymer with an aluminum receiver. Many components, including the barrel block (trunnion), gas block, bolt catch, 7.62 mag conversion bar, ejector retainer, and extractor link, are produced using metal injection molding (MIM) by Indo-MIM Pvt. Ltd., India, which received a 2017 distinction in hand/tools award by PIM International for innovation in MIM development and part cost reduction.

The MDR is compatible with Desert Tech caliber conversion kits, allowing the rifle chassis to accept both intermediate cartridges and full-powered rifle cartridges on the same serial number platform, such as 5.56×45mm NATO and 7.62×51mm NATO magazines. The Colt CM901 is noted as an early design able to accept different cartridge categories on the same platform with a caliber conversion kit. The .308/7.62 MDR underwent a 10,000-round endurance test with various ammunition types, averaging 1 failure in 2000 rounds.

Public feedback on the 2017 MDR in .308/7.62 led to an upgrade program in 2019, addressing the gas and extractor system to improve ammunition tolerance without frequent gas adjustments, considered the Generation 2 MDR Gas System. Desert Tech publicly addressed criticism on January 10, 2019, attributing the most vocal criticism to InRangeTV in collaboration with Forgotten Weapons, which demonstrated failures from varying ammunition loads on December 13, 2018. Desert Tech provided a technical root cause analysis and offered the Generation 2 gas system upgrade under warranty. The MDRx variant, marketed as a separate firearm in 2020, included improvements such as improved impact-resistant polymer, trigger, gas block, and a new 'Ratchet' compensator, and was offered in .300 BLK, 6.5 Creedmoor (the first production semi-auto bullpup in that cartridge), along with original calibers and 20-inch barrel and side ejection options, considered the Generation 3 MDR gas system.

Reader's Guide

The Desert Tech MDR family represents a notable attempt to create a modular, ambidextrous bullpup platform capable of accepting both intermediate and full-power cartridges through caliber conversion kits. Its design incorporates modern manufacturing techniques like metal injection molding, and it underwent several revisions in response to user feedback, including gas system upgrades and the introduction of the MDRx variant. The MDRx was rated by the manufacturer between 1-2 MOA, though a 2022 community study found stock OEM barrel performance in .308 ranged from 1.9 to 5.6 MOA with various ammunition, and identified trunnion fastener loosening over time. A May 6, 2024, accuracy study by Desert Tech found best unsuppressed performance of the MDR/MDRx in .308 was 2.7 MOA, 1.2 MOA worse than the guaranteed 1-2 MOA, placing it as the second worst performing rifle tested; suppressed performance improved to 1.5 MOA. Desert Tech attributed poor mechanical performance to bullet-barrel harmonic vibration due to gas block location near the chamber, a lightweight non-match grade barrel, and patrol rifle trigger pull, and noted that suppressors improved accuracy by upwards of 1 MOA. The platform saw aftermarket support, including the BLK LBL Mantis handguard with integrated bipod and ES Tactical caliber conversion kits in .350 Legend and .450 Bushmaster. The MDR was discontinued on January 18, 2024, with a third generation successor announced as the Desert Tech WLVRN.

Did You Know?

• The MDR's first public debut was in 2014 at Shot Show and was discontinued on January 18, 2024.
• The MDRx was the first production semi-auto bullpup chambered in 6.5 Creedmoor.
• A 2024 Desert Tech accuracy study found the MDR/MDRx in .308 achieved 2.7 MOA unsuppressed and 1.5 MOA suppressed.