MIL-DTL-0050863D (AR)
3.4.1 Velocity. When fired from the MK19, MOD III, Grenade Machine Gun, the average
velocity of the sample cartridges shall be 790 ± 10 feet per second (fps) with a standard deviation
not exceeding 12.0 fps or less.
3.4.2 Security of crimp of base plug and action time. When fired from the M129 Grenade
Launcher, the action time of the cartridge, shall not exceed 4 milliseconds and there shall be no
base plug movement more than .005 above flush with the rear of cartridge case after firing.
3.4.3 Impact functioning. When fired single shot from a MK19, MOD III, Grenade
Machine Gun the projectile assembly upon impact shall function satisfactorily as evidenced by
smoke, flash and sound. There shall be no evidence of an early burst (see 6.12.2).
3.4.4 Safety. When fired from the MK19, MOD III, Grenade Machine Gun and M129
Grenade Launcher the projectile shall not lodge in the bore of the weapon and there shall be no
evidence of a premature burst (see 6.12.3).
3.4.5 Penetration. When fired from the M129 Grenade Launcher, the shaped charge in the
projectile shall penetrate a minimum of 3 inches of mild steel. There shall be no evidence of an
early burst (See 6.12.2).
3.4.6 Rapid fire. When rapid fired from Mk19, Mod III, Grenade Machine Gun there shall
be no evidence of an early burst (see 6.12.2).
3.4.7 Primer functioning. The primer shall function without evidence of misfires (see
6.12.5) and in accordance with MIL-P-60942. There shall be no evidence of primer leak as
evidenced by perforation of primer cup or smoke deposit on base plug or cartridge case.
3.5 Ammunition lot numbering. Ammunition lot numbers shall be assigned in accordance
with MIL-STD-1168.
3.6 Workmanship. All parts and assemblies shall be fabricated and finished in a thorough
and workmanlike manner. They shall be free of burrs, chips, sharp edges, cracks, unblended radii,
surface defects, dirt, grease, rust, corrosion products and other foreign matter. The cleaning
method used shall not be injurious to any parts, nor shall the parts be contaminated by the cleaning
agents. All marking and stamping shall be neat and sharply defined.
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