24. Disassembly (fig. 61)
Disassemble the trigger housing group in accordance with FM 23-5.
25. Inspection
a. General. Inspect all parts for damage, wear, burs, rust,
foreign matter in recesses, deformation, and free action with mating
parts. Additional inspection procedure is presented in the following
paragraphs.
b. Hammer. Check the nose of the hammer for wear or
chipping. (See fig. 62) Chips indicate excessive hardness and warrant
replacement of hammer. Check sear and trigger notches for wear.
c. Safety. The safety is subjected to little wear and
therefore fails mainly as a result of breakage. Breaks usually occur at
the points indicated in figure 63. Either the type of early manufacture or
of present manufacture is satisfactory for use.
d. Trigger Assembly. Inspect the trigger assembly for wear
on hammer-engaging notches indicated in figure 64. Also check for broken
edge in front of the hole as indicated.
e. Hammer Spring Housing. The hammer spring housing usually
fails as a result of breakage. Inspect for cracks at the point indicated
in figure 65. This is a visual inspection only.
26. Maintenance and Repair
a. Trigger Guard. (1) Excessive force is sometimes
required to close the trigger guard on the rifle. (See
fig. 61) This is
usually true where the climate is humid, and is the result of an increased
moisture content which makes the stock swell. When this condition is
encountered, correct by removing very fine shavings of wood from the
underside of the stock along the bearing surface of the trigger group with
a fine file until the proper fit is obtained. This surface is at a 10°
angle to the horizontal. Use extreme care to maintain the 10° angle and to
remove the same amount of wood from both sides of the stock. As the wood
is removed, determine the force required to lock the trigger guard by
frequent reassembly. The normal force required to close the trigger guard
is reasonable but not excessive. The trigger guard must not be loose as
this is the only point at which the action is locked in its bedding. make
certain the guard latches properly.
(2) When the bow in the trigger guard is bent
up to interfere with the tip of the trigger, it can be straightened or the
tip of the trigger ground off. When the trigger guard locking lugs become
worn, peen lightly (fig. 66) to resize them and then dress to shape with a
fine file. The trigger guard fork may become sprung in, thus causing
binding, or sprung out, thus preventing the hammer pin from extending far
enough through for proper bearing. Correct these faults by springing the
fork back into correct position.
b. Trigger Housing. Modify the pads on the upper rear corner
of the trigger housings of early manufacture to the dimensions of present
manufacture, as shown in figure 67. This is required to enable assembly of
current design safeties.
c. Correcting Trigger Pull (1) Trigger pull too light.
This is evidence of worn lugs on the trigger, worn lugs on the hammer, or
a weak hammer spring. Examine the components for wear and replace with new
components.
(2) Trigger pull excessive. This is caused by burs on the lugs of
the trigger, burs on the lugs of the hammer that engage the lugs on the
trigger, a hammer spring that is too heavy. an obstruction or foreign
material in the hammer spring housing that prevents proper seating of the
hammer spring, or a bent trigger that rubs against the trigger housing.
Examine the parts for defects, remove all burs with a fine sharpening
stone, and replace defective parts.
(3) Creep in trigger. Slightly rough contacting surfaces of the
trigger lug may cause "creep" in the trigger, and are to be removed with a
fine sharpening stone. Stone to a polish only, being careful to maintain
proper level and angle.
d. Bent Safety. When the safety is bent so that it binds in
the trigger guard cut, it is to be replaced. It cannot be straightened
because it is hardened steel.
27. Assembly
a. General. Assemble the
trigger housing group in accordance with FM 23-5.
b. Installing trigger Pin. When assembling a large quantity
of trigger housing assemblies, use the fixture to speed up work. This
fixture is improvised and is to be made locally. (See
fig. 17) To seat the
trigger pin head, place the trigger housing, open side up in the fixture,
and engage the lug between the sear and trigger (fig. 68); compress hammer
spring, align holes, and install trigger pin. |
