Figure 3-35.--Major component groups and assemblies.
Remove Barrel Group
The actions required to remove the barrel group are
Figure 13-35 shows the major component groups
shown in figure 13-36. Turn the cover latch lever
and assemblies of the .50-caliber BMG. For routine
forward and raise the cover group (view A). Pull the
cleaning and maintenance, you need to know the general
retracting slide (bolt) handle to the rear slowly (view B).
disassembly procedures. Detailed disassembly
That moves the recoiling parts of the gun to the rear.
procedures remove all parts from each group. These
Pull rearward until the lug on the barrel locking
steps are explained in the FM23-65 of the U.S. Army.
spring aligns with a 3/8-inch hole. The hole is in the right
Be sure to consult the field manual if you must do a
sideplate of the receiver, just below the feedway exit.
The barrel can be turned only when the lug is aligned
Before starting general disassembly procedures,
with the 3/8-inch hole. Place the smallest loop of a
.50-caliber belt link (or suitable spacer) between the
you must clear the weapon. This includes ensuring the
trunnion block and the barrel extension. This holds the
gun is unloaded, cocked, and the bolt is forward. The
barrel locking spring lug in alignment with the 3/8-inch
primary steps involve removal of the following parts:
hole in the right sideplate (view C).
1. Barrel group
Now, unscrew the barrel from the receiver (view D).
2. Backplate assembly
Be careful not to damage the threads or barrel-locking
notches when setting the barrel down. Complete this
3. Driving spring rod assembly
phase of disassembly by pulling back slightly on the
4. Bolt stud
retracting slide handle. Then remove the .50-caliber link
(or spacer) from the receiver. Do not allow the bolt to
5. Bolt group
slam forward with the barrel removed; this causes
6. Buffer body and barrel extension groups
damage. Let the retracting slide handle (and bolt) ease
7. Buffer assembly