The 5.56 x 45mm NATO ammunition cartridge is an intermediate cartridge first developed by FN Herstal. Over the years the 5.56 has become increasingly popular in many areas but more so in military applications, competitive fi rearms, and home defense applications.
Drawn from premium American-made brass cups, these casing are rigorously tested to ensure unparalleled durability and dependability, each casing undergoes rigorous in-line and postproduction quality assurance testing to ensure a flawless casing.
Standard casing dimensions and tolerances have been modified to achieve maximum performance. Jagemann™ Sporting Group’s in-house tooling and engineering capabilities provide the ability to customize casing dimensions for use with specific projectiles.
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Date of Origin: 1961
Case Type: Rimless, Bottleneck
Neck Diameter: .253 in (6.4 mm)
Shoulder Diameter: .354 in (9.0 mm)
Base Diameter: .377 in (9.6 mm)
Rim Diameter: .378 in (9.6 mm)
Base Thickness: .045 in (1.1 mm)
Case Length: 1.76 in (45.0 mm)
Primer Type: Small Rifle
Max Pressure: 55,114 psi (380 MPa)