5.7x40mm AVA

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5.7x40mm EC
5.7x40mm.png
TypeRifle
Place of originEntente Cordiale
Service history
In service1978–present
Used bySieuxerr
Sylva
New Tyran
EC
WarsVarious
Production history
DesignerSaint-Étienne Arms Manufacturer
Designed1977
ManufacturerMAS
Manurhin
Various other plants
Specifications
Case typeRimless
Bullet diameter5.7mm (0.224 in)
Neck diameter6.5mm (0.25 in)
Shoulder diameter8.3mm (0.32 in)
Base diameter9mm (.35 in)
Rim diameter9mm (.35 in)
Rim thickness1.5mm (.05 in)
Case length40mm (1.57 in)
Overall length56.4mm (2.22 in)
Rifling twist1:12
Primer typeSmall rifle
Ballistic performance
Bullet mass/type Velocity Energy
57 gr (4 g) Balle A 2,800 ft/s (850 m/s) 1,300 ft⋅lbf (1,800 J)
Source(s): Arsenal Munitions Test Range

The 5.7x40mm EC is a rimless, bottlenecked, center-fired intermediate cartridge family. Designed in the mid-1970s, the 5.7mm EC and 7x51mm EC cartridges and their weapons would become standardized across the Entente and Entente-aligned nations by the 1980s.