Heckler&Koch MR762A1 User Manual

Page 15

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