Heckler&Koch MR762A1 User Manual

Page 18

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. 59).

Fig. 59 – 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. 60).

Fig. 60 – 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. 61).

Fig. 61 – Firing Pin Retaining Pin Installation

f. Turn the upper receiver upside down, insert the charging handle into the upper

receiver, align the lugs on the outsides of the charging handle with the recesses on the

inside of the upper receiver then press down until the charging handle is flush with the

inside of the receiver then press slightly forward (Fig. 62).

Fig. 62 – Charging Handle Installation

g. With the upper receiver and charging handle upside down, install the bolt assembly

onto the bottom of the charging handle ensuring that the bolt carrier’s anvil and the

top of the cam pin are centered in the bottom cavity of the charging handle (Fig. 63).