MIL-DTL-71186A
bolt carrier without binding.
3.5.13.5.2 Cam pin retention. The cam pin shall be securely retained in the bolt assembly
by the firing pin.
3.5.13.5.3 Cam pin disassembly. The cam pin shall be capable of being removed from
the bolt carrier without removal of the bolt carrier key assembly.
3.5.13.5.4 Cam pin symmetry. The cam pin shall be capable of being disassembled from
the bolt and bolt carrier assembly and reassembled 1800 about its vertical axis from its original
position without causing binding in the assembly.
3.6 Functional characteristics.
3.6.1 Firing pin indents.
3.6.1.1 Firing pin indent. The weapon shall meet the requirement of the bolt action
indent, muzzle down position indent and firing pin indent position.
3.6.1.2 Bolt action indent. When the bolt is closed and the firing mechanism is released,
the firing pin indent shall not be less than 0.020 inches.
3.6.1.3 Muzzle down position indent. When in a muzzle down position, the bolt carrier
assembly shall be released from the full recoil position and the firing mechanism shall not be
actuated, the firing pin indent shall not be greater than 0.008 inches.
3.6.1.4 Firing pin indent location. The firing pin indent shall not be off-center more than
one half the maximum diameter of the indent.
3.6.1.5 Firing pin protrusion. The firing pin protrusion shall not be greater than 0.036
inches and shall not be less than 0.028 inches.
3.6.2 Trigger pull.
3.6.2.1 Minimum trigger pull. The minimum trigger pull shall not be less than 5.5
pounds.
3.6.2.2 Maximum trigger pull. The maximum trigger pull shall not be greater than 8.5
pounds.
3.6.2.3 Creep. The M4A1 trigger shall be free of perceptible rough movement between
the time the trigger slack is taken up and the hammer is released.
3.6.3 High pressure resistance.
3.6.3.1 High pressure resistance test. The barrel assembly in accordance with drawing
12
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business