Owner's Manual

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The MDR has unrivaled portability because it is lightweight, compact, ergo-
nomic, and balanced, with an overall length of 26.2” with a 16” barrel and a
weight of 8.35 pounds.
The MDR is adaptable in both size and caliber. It can quickly convert between
multiple calibers, and its gas-block incorporated picatinny rail and the Desert
Tech barrel retention system allows for consistent return-to-zero between
conversions. The barrel is also truly free-floated by design so barrel whip does
not affect accuracy.
Adaptable
FACTS ABOUT THE MDR
The MDR is designed for future defense needs. Its compact size and superior
ergonomics maximize its portability without sacrificing speed, power, or
precision. The MDR allows mission-specific adaptability by changing the
rifle’s length, sound signature, and caliber. Its fully-ambidextrous design
allows seamless shoulder transitions. The MDR delivers advanced firepower
for the future patriot.
KEY FEATURES
Portable
Ambidextrous
The MDR is fully ambidextrous with no modification necessary.
Our patented forward ejection mechanism and intuitive controls
set a new bullpup standard for speed and precision.
ERGONOMIC FEATURE LIST
• Ambidextrous charging handle
• Ambidextrous magazine release above the trigger and central
release forward of the magazine well, which facilitates rapid reloads
• Ambidextrous Fire Selector
• Last-round bolt catch/release for rapid reloads
• Ambidextrous forward ejection, allows shooters to fire right- or
left-handed as well as swap the ejection sides in the field
• Forward-ejection dust cover prevents debris from entering the
action and causing malfunctions
• Crisp 4.6 lb trigger
• Rear flush cup sling attachment points
• MLOK handguard slots for accessory and sling mounting option
• Weapon balance point is just rear of the pistol grip, giving the rifle
a stable, yet highly maneuverable, weight distribution
FIREARM CONSTRUCTION
• The barrel is attached to the receiver by two barrel retention
screws and a barrel locking lug
• The polymer handguard is attached securely to the upper receiver
with a captured pin and two handguard reinforcement screws
• A full-length, MIL-STD-1913 rail runs along the top of the
receiver and handguard, facilitating optics, night vision, thermals
and other accessories. Rail segments attach to the sides for
user-specified placement utilizing the MLOK attachment system
• The MDR is available in Black and Flat Dark Earth; all rifles are
hard-coat anodized Black or Flat Dark Earth
RIFLE SETUP
WARNING: Carry out the following operations before dismantling: Move safety selector to “Safe”
remove the magazine, open the bolt and visually ensure the chamber is clear (page 23).
WARNING: DO NOT REMOVE ANY OF THE TORX RECEIVER SCREWS ON EITHER THE RIGHT OR LEFT
SIDES OF THE MDR! IT WILL VOID THE WARRANTY AND CAUSE THE RIFLE TO MALFUNCTION!
1.
2.
3.
a) Conversion Kit Installation / Initial Setup
Remove the MDR receiver, barrel assembly, handguard,
magazine, and the multi-tool from the MDR case.
Place the MDR on “Safe” by rotating the safety selector switch
clockwise into the “Safe” position. (Counter-clockwise for left
side manipulation) (Fig. a-1)
On the MDR handguard, use the T25 side of the multi-tool,
loosen by two turns DO NOT REMOVE the two T25
torqueset handguard retention screws on the right and left
side of the MDR Handguard. (Fig. a-2)
If removed, reinstall the handguard support backing plates to the inside of
the MDR Handguard receiver with the raised portion facing to the outside
of the handguard, and thread the handguard screws in from the outside of
the handguard in until flush, then back them off two full turns. See page 65
for parts breakdown.
Fig. a-1
Fig. a-2
SETUP