Owner's Manual

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5.
Repeat this process on the left side with the ejection panel to complete the ejection side reconfiguration process.
The MDR may also be fired without the chute panel, in which case the empty cartridges will eject in the
standard 90-degree fashion from the rifle. Be careful to note which side it ejects from in this configuration,
as hot casings may potentially hit the shooter’s face while firing if the ejection port is on the same side as
the shooter’s head.
1.
2.
3.
4.
The MDR is 100% ambidextrous in its factory configuration; all
user controls can be operated on either side and spent casings eject
forward, away from the shooter’s face. However, depending on shooter
preference, the ejection side can quickly be changed from right to left.
Place the MDR left side up. Use any instrument that has
a small, strong edge to it, (such as the open end of a
spent cartridge) and press the ejection panel release tab
forward (Fig. d-1) and up to remove the ejection panel.
(Fig. d-2)
Ensure the rifle is clear and safe, and the bolt assembly is
in the charged, forward-most position.
WARNING: The charging handle MUST be in the forward position
before removing the ejection panel and chute panel (page 23).
Rotate the MDR to the right side and, using the same
method, remove the chute panel.
Replace the chute panel where the ejection panel was
by inserting the front of the ejection panel front lips to
the inside of the receiver ejection window, then pressing
the back of the chute panel until the release tab snaps in
place. See Fig. d-3, d-4 for panel reference images.
d) Ejection System
Fig. d-1
Ejection Panel Fig. d-2
Ejection Panel Fig. d-4
Chute Panel Fig. d-3
SETUP SETUP