5.56mm M193 Ball Cartridge (Lake City 1970)

Images

Specifications

Historical Summary

The 5.56mm M193 Ball cartridge represents the early standard U.S. small-caliber service loading associated with the M16 rifle family during the Vietnam War era. Loaded with a 55-grain full metal jacket boat-tail bullet and intended for use in the M16 and M16A1, it became one of the most recognizable U.S. military rifle cartridges of the late 1960s and early 1970s. In Army ammunition data, the M193 is identified by its plain bullet tip and listed with a nominal velocity of approximately 3,250 feet per second from the standard test setup.

A 1970 headstamp places this example squarely within the period of heavy American involvement in Southeast Asia. By that date, the M16A1 had become widely established in U.S. service, and Lake City production was part of the broader wartime effort to supply large quantities of 5.56mm ammunition for training, combat issue, and stateside reserve stocks. For collectors, an LC 70 round offers a direct material link to that mature phase of Vietnam-era logistics and ammunition production.

Lake City Army Ammunition Plant has long been one of the principal U.S. government facilities for small-arms ammunition manufacture. Its headstamps are especially familiar to collectors because they appear on a broad range of U.S. military calibers spanning the Second World War, the Cold War, and into the modern era. On 5.56mm ammunition, the simple two-digit date format makes identification straightforward and gives individual cartridges clear placement within the larger timeline of U.S. service use.

The example documented here is made more visually interesting by the accompanying carton, which is a reproduction of a 20-round box labeled in the style of a 5.56mm M197 high-pressure test package. That style of carton is appropriate for proof or test ammunition, not standard ball issue. Including the reproduction box in the display helps illustrate period packaging aesthetics, but it is important to note that the cartridge itself is a regular M193 ball round and should not be confused with a high-pressure test load.

Collector Notes

Vietnam-era 5.56mm cartridges remain popular with U.S. military ammunition collectors, especially when paired with rifles, web gear, manuals, or other artifacts from the M16A1 period. A loose LC 70 round is not exceptionally rare on its own, but it becomes more desirable when well preserved, clearly headstamped, and documented in a display context that explains its place in U.S. military history.

Collectors typically examine the clarity of the headstamp, overall brass condition, the presence and color of primer sealant, and whether the bullet and case mouth remain free of corrosion or handling damage. The purple primer annulus sealant visible on this example is a useful identifying characteristic and contributes to the cartridge's visual appeal in close-up photography.

As with many collectible cartridges, packaging context matters. Because the pictured box is a reproduction rather than an original issue carton for this round, its value is mainly educational and visual. The authentic historical object here is the cartridge itself, and documenting that distinction preserves accuracy while still allowing a stronger display presentation.

Provenance

• Acquired on the civilian collector market as a Vietnam-era U.S. 5.56mm M193 cartridge; no specific military unit history is known.
• Headstamp and physical characteristics are consistent with Lake City production in 1970.
• The pictured carton is a modern reproduction used for display only; the cartridge is the primary historical artifact documented on this page.
• Preserved in the Relics & Rifles reference collection as a non-firing specimen.