MIL-DTL-001298D (AR)
3.10 Functioning. The M2 shall function without malfunctions attributable to
the weapon, and without evidence of unserviceable parts.
3.11 Belt pull. The M2 shall be capable of functioning while a 20 pound free
hanging weight is attached to the ammunition belt.
3.12 Cyclic rate of fire. The M2 shall maintain an average rate of fire of 450 to
600 shots per minute.
3.13 Targeting and accuracy.
3.13.1 Targeting and accuracy M2 Browning machine gun flexible. The M2 flex
Drawing 7265636 shall have the rear sight set at zero elevation, the windage scale adjusted to
zero and the sights aligned at 6 o'clock on the sighting image of a target meeting the
requirements of Drawing 7266955 the center of impact of a 10 round burst shall be within
the 8.0 inch diameter circle shown on the drawing and all shots shall group within or cut the
edge of a 8.0 inch diameter circle at a range of 100 feet.
3.13.2 Accuracy M2 Browning machine gun turret type (M48 Series). The M2
turret type Drawing 12002953 shall be bore sighted on the point of aim on the sighting image
of a target meeting the requirements of Drawing 7266955, the center of impact of a 10 round
burst shall be within the 8.0 inch diameter circle shown on the drawing and all shots shall
group within or cut the edge of a 8.0 inch diameter circle at a range of 100 feet.
3.14 Endurance. The M2 shall be capable of firing a test schedule of 10,000 rounds
of M33 ball cartridges, using M9 links, without substitution of any components and without
malfunctions in excess of the limits shown in Table I.
3.15 Barrel Erosion. The M2 barrel assembly shall be capable of firing a 10,000 round
test schedule without experiencing a muzzle velocity drop of more than 200 feet per second.
3.16 Interchangeability. All M2 parts shall be interchangeable, unless otherwise
specified. (In manual assembly operations, there shall be no objections to preferential
assembly of parts provided that all parts are dimensionally acceptable).
3.16.1 Concurrent spare parts. All M2 concurrent repair parts shall be interchangeable,
unless otherwise specified.
3.17 Interplant interchangeability. All M2s manufactured concurrently by more than one
contractor shall be interchangeable. Each contractor shall submit monthly six M2s for
verification, unless otherwise specified.
3.18 Marking. Each M2 and each component thereof for which markings are
prescribed, shall be clearly marked in accordance with the applicable drawing and MIL-STD-
130.
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