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XM645LaterType
5.56×57mm XM645
Country of origin

United States of America

Manufacturers

AAI Corporation

Designer

Irwin R. Barr

Year(s) designed

1965

Cartridge type

Centerfire; Bottlenecked

Overall length

62.54mm

Case length

56.93mm

Neck diameter

6.3mm

Shoulder diameter

6.94mm

Rim diameter

7.9mm

Rim thickness

1.09mm

Primer type

Piston (early rounds)
Berdan (later rounds)

The 5.56×57mm XM645 is an experimental military cartridge developed by AAI for Project NIBLICK.

DetailsEdit

The XM645 is a redesign of the older XM110 round. The casing is 4mm longer in length, while eliminating the concave bottom area of the casing structure. Early examples also implement a new single-piece piston primer, while later rounds used traditional Berdan primer caps.

Like the XM110 before it, the projectile is a steel flechette encased in a green fiberglass. Later examples of the ammunition has the flechette encased in a white synthetic bale.

GalleryEdit

ReferencesEdit

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