Heckler&Koch MR762A1 - Manual (Page 20)

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FUNCTION CHECK
WARNING: Always ensure the MR762A1 is unloaded prior to attempting to perform
a function check.
NOTE: The MR762A1’s selector lever can be placed on safe regardless of the
position of the hammer. Legacy AR15/M16 platforms and many of their large caliber
counterparts (7.62 x 51 mm/.308 caliber) require that the hammer be cocked prior to
attempting to place the firearm on “SAFE”.
FUNCTION CHECK PROCEDURE
1. Perform clearing procedure (see above) and ensure selector lever is set on “Safe”.
2. Place the muzzle in a safe direction and rack the bolt to the rear three or four
times in quick succession by using the charging handle. The bolt should not bind
when traveling back and forth in the receiver.
3. “SAFE”: Let the bolt go forward and completely go into battery. With an
unloaded MR762A1 and the muzzle in a safe direction, ensure the selector lever is
set on “Safe” and attempt to pull the trigger. The hammer must not fall.
4. “SEMI-AUTOMATIC”: Rotate the selector lever to “Semi-Automatic” (Single Shot)
and with an unloaded MR762A1 and the muzzle in a safe direction, attempt to
pull the trigger and hold to the rear. The hammer must fall.
5. While maintaining pressure on the trigger, rack the bolt and release. The hammer
should be held by the disconnector.
6. Release the trigger.The hammer should be caught by the sear as signified by a
metallic click. Release the trigger completely and re-engage the trigger. Hammer
must fall.
7. Insert an empty magazine into the magazine well and pull back on the charging
handle. The magazine follower should engage the bolt catch and lock the bolt to
the rear on an empty chamber.
8. Remove the magazine and allow the bolt to go into battery, either by depressing
the bolt catch or by pulling the charging handle slightly back towards the rear and
then releasing.
9. Ensure that the MR762A1 is unloaded, place the muzzle in a safe direction and
pull the trigger to ease the tension on the trigger spring.
10. Place the selector lever back on “Safe” and snap the dust cover into position over
the ejection port.
MAGAZINE DISASSEMBLY
CAUTION: Parts are under considerable spring pressure. Wear safety goggles and
point the base of the magazine housing in a safe direction when disassembling or
assembling. Read the complete procedure before attempting to disassemble the
magazine.
To disassemble the magazine for cleaning or inspection, push in the locking plate button
(located in a hole in the magazine floorplate) with a finger, cleaning rod, cartridge, or
similarly shaped object. As you depress the locking plate through the floorplate hole o,
push the floorplate towards the rear of the magazine housing (Fig. 67). Once the floorplate
is clear of the magazine housing; the locking plate, spring, and magazine follower can
easily be removed. Take note as to the arrangement of these parts for reassembly (Fig. 68).
For cleaning purposes, it is not necessary to disassemble the follower and locking plate
from the spring. Both 20 and 10-round magazines are disassembled and reassembled in
the same matter.
Fig. 67 – Magazine Disassembly
Fig. 68 – Magazine Components (20 round shown)