Heckler&Koch MR762A1 - Manual (Page 15)

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Fig. 42 – Slide the Bolt Head out
g. Further disassembly of the bolt head, including removal of the extractor is not
recommended (Fig. 43).
Fig. 43 – Bolt Head
Fig. 44 – Bolt Assembly Components
CAUTION: Removal of the MR762A1 extractor and the ejectors by the operator is
not recommended.
4. Upper Receiver
a. Insert a 5mm hex (Allen) wrench into the retaining screw located on the lower right
hand side of the Free Floating Rail System (handguard) and rotate counter clockwise
(Fig. 45). Once loosened, drift out the retaining screw from left to right until the
retaining screw reaches its limit of lateral travel. Other applicable rail systems and
handguards attach using standard machine screws (including SW11 type). Removal
and installation of these rail systems and handguards is essentially the same as for
Free Floating Rail System.
WARNING: The retaining screws for the Free Floating Rail System (FFRS) handguard
are held captive by small shaped springs located on the lower right hand side of the
handguard. Attempting to completely remove the retaining screw could lead to
damage of the handguard, shaped springs, and/or retaining screws.
Fig. 45 – Loosening the FFRS screws with hex (Allen) wrench
b. Slide the Free Floating Rail System (FFRS) off the barrel nut and remove the FFRS
from the upper receiver.
c. Grasp the rear of the gas piston while pushing back on the piston rod. Disengage
the piston rod from the piston and slide out the piston rod from the upper receiver
(Fig. 46).
Fig. 46 – Removing Piston Rod
d. Slide the gas piston to the rear and remove the gas piston from the gas block (Fig.
47).
Fig. 47 – Removing Gas Piston