MIL-DTL-70599 Carbine, 5.56 Millimeter: M4This detail specification prescribes the requirements and identifies the verification procedures for the lightweight, air-cooled, gas operated, magazine-fed, 5.56 millimeter \(mm\) weapon designed for either three shot automatic burst or semi-automatic fire, hereafter referred to simply as the weapon.

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MIL-DTL-70599C

3.5.13.2 Bolt assembly retention. The bolt assembly shall be securely retained in the bolt

carrier by the bolt cam pin.

3.5.13.3 Extractor.

3.5.13.3.1 Extractor motion. The extractor shall move between its rest position (no

cartridge present) and its active position (cartridge present) without binding in the bolt.

3.5.13.3.2 Extractor action. The extractor shall be capable of engaging and extracting

cartridge cases from the barrel chamber when the weapon is function fired or manually operated.

3.5.13.3.3 Extractor retention. The extractor shall be securely retained in the bolt by the

extractor pin.

3.5.13.4 Ejector.

3.5.13.4.1 Ejector motion. The ejector shall move between its raised position (no

cartridge present) and its recessed position (cartridge present) without binding. Ejector

movement from its recessed position to its raised position shall be under spring action.

3.5.13.4.2 Ejector action. The ejector shall eject cartridge cases completely out of the

weapon when the weapon is function fired or manually operated.

3.5.13.4.3 Ejector retention. The ejector shall be securely retained in the bolt by the

ejector pin.

3.5.13.5 Cam pin.

3.5.13.5.1 Cam pin motion. The cam pin shall move through its full range of travel in the

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