(Verbatim from FM 23-5 U.S. Rifle Caliber .30, M1)
Disassembly into the Three Main Groups :
A. The three main groups are the trigger housing group, the barrel and receiver group and the stock group.
B. To disassemble the rifle into the three main groups, first insure that the weapon is clear and then allow
the bolt to go forward by depressing the follower with the right thumb and allowing the bolt to ride forward over the follower
assembly. (note: careful, m1's are always hungry and eat thumbs).
C. Place the rifle butt against the left thigh, sights to the left. With the thumb and forefinger of the right
hand, pull downward and outward on the rear of the trigger guard. Swing the trigger guard out as far as it will go and lift
out the trigger housing group.
D. To separate the barrel and receiver from the stock lay the weapon on a flat surface with the sights up, muzzle
to the left. With the left hand, grasp the rear of the receiver and raise the rifle. With the right hand, give a downward
blow, grasping the small of the stock. This will separate the stock group from the barrel and receiver group.
The M1 is a robust weapon.