Heckler&Koch MR762A1-LRP - Manual (Page 16)

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3. Bolt Assembly:
Fig. 42 – Bolt Assembly viewed from bolt face
Fig. 43 – Bolt Assembly components
a. Slide the bolt head into the bolt carrier until the circular mounting surface for the
cam pin on the bolt heads aligns with the front of the raceway on the bolt head
carrier. Pointed down range, the extractor should be on the right hand side of the
bolt carrier and ejector should be on the left (Fig. 44).
Fig. 44 – Bolt Carrier reassembly
NOTE: The bolt head on the MR762A1 features a tapered mounting surface for the
cam pin. This feature ensures that the bolt must be properly positioned in the bolt
carrier before attempting to install the cam pin.
b. Insert the cam pin into the shaft of the bolt carrier, ensuring that the hole for the
firing pin on the cam pin is aligned with the firing pin tunnels on both the bolt head
and bolt carrier (Fig. 45).
Fig. 45 – Bolt Carrier reassembly
c. Ensure that the captive firing pin retaining pin is drifted completely out to the left
hand side of the bolt carrier. Insert the firing pin spring onto the firing pin, pivot
upwards on the spring loaded firing pin safety, and insert the firing pin and spring
into the bolt carrier’s firing pin tunnel until the firing pin reaches its limit of forward
travel (Fig. 46).
Fig. 46 – Installing the Firing Pin
d. While maintaining forward pressure on the back of the firing pin, drift the firing pin
retaining pin from left to right.
e. Ensure that the firing pin retaining pin is properly installed by pivoting upwards on the
firing pin safety while pushing backwards on the bolt head. The firing pin should be
retained inside the bolt carrier (Fig. 47).