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5.56×45mm NATO
5.56×45mm NATO with measurement, left to right: bullet, empty case, complete round with bullet in casing
Type	Rifle
Place of origin	United States
Service history
In service	Since 1963
Used by	NATO
Wars	Since Vietnam War
Production history
Designer	Remington Arms
Specifications
Parent case	.223 Remington
Case type	Rimless, bottleneck
Bullet diameter	5.70 mm (0.224 in)
Neck diameter	6.43 mm (0.253 in)
Shoulder diameter	9.00 mm (0.354 in)
Base diameter	9.58 mm (0.377 in)
Rim diameter	9.60 mm (0.378 in)
Rim thickness	1.14 mm (0.045 in)
Case length	44.70 mm (1.760 in)
Overall length	57.40 mm (2.260 in)
Case capacity	1.85 cm3 (28.5 gr H2O)
Rifling twist	178 mm or 229 mm (1 in 7 in or 9 in, originally 1 in 14 in)
Primer type	Small rifle
Maximum pressure (EPVAT)	430.00 MPa (62,366 psi)
Maximum pressure (SCATP 5.56)	380.00 MPa (55,114 psi)
Ballistic performance
Bullet mass/type Velocity Energy 4 g (62 gr) SS109 FMJBT 940 m/s (3,100 ft/s) 1,767 J (1,303 ft⋅lbf) 4.1 g (63 gr) DM11 FMJBT 936 m/s (3,070 ft/s) 1,796 J (1,325 ft⋅lbf) 4.1 g (63 gr) GP 90 FMJBT 905 m/s (2,970 ft/s) 1,679 J (1,238 ft⋅lbf)
Test barrel length: 508 mm (20.0 in) Source(s): NATO EPVAT testing, QuickLOAD, SAAMI, C.I.P.

5.56×45mm NATO
5.56×45mm NATO with measurement, left to right: bullet, empty case, complete round with bullet in casing
Type	Rifle
Place of origin	United States
Service history
In service	Since 1963
Used by	NATO
Wars	Since Vietnam War
Production history
Designer	Remington Arms
Specifications
Parent case	.223 Remington
Case type	Rimless, bottleneck
Bullet diameter	5.70 mm (0.224 in)
Neck diameter	6.43 mm (0.253 in)
Shoulder diameter	9.00 mm (0.354 in)
Base diameter	9.58 mm (0.377 in)
Rim diameter	9.60 mm (0.378 in)
Rim thickness	1.14 mm (0.045 in)
Case length	44.70 mm (1.760 in)
Overall length	57.40 mm (2.260 in)
Case capacity	1.85 cm3 (28.5 gr H2O)
Rifling twist	178 mm or 229 mm (1 in 7 in or 9 in, originally 1 in 14 in)
Primer type	Small rifle
Maximum pressure	430.00 MPa (62,366 psi)
Ballistic performance
Bullet mass/type Velocity Energy 4 g (62 gr) SS109 FMJBT 940 m/s (3,100 ft/s) 1,767 J (1,303 ft⋅lbf) 4.1 g (63 gr) DM11 FMJBT 936 m/s (3,070 ft/s) 1,796 J (1,325 ft⋅lbf) 4.1 g (63 gr) GP 90 FMJBT 905 m/s (2,970 ft/s) 1,679 J (1,238 ft⋅lbf)
Test barrel length: 508 mm (20.0 in) Source(s): NATO EPVAT testing, QuickLOAD, SAAMI, C.I.P.

5.56×45mm NATO
5.56×45mm NATO with measurement, left to right: bullet, empty case, complete round with bullet in casing
Type	Rifle
Place of origin	United States
Service history
In service	Since 1963
Used by	NATO
Wars	Since Vietnam War
Production history
Designer	Remington Arms
Specifications
Parent case	.223 Remington
Case type	Rimless, bottleneck
Bullet diameter	5.70 mm (0.224 in)
Neck diameter	6.43 mm (0.253 in)
Shoulder diameter	9.00 mm (0.354 in)
Base diameter	9.58 mm (0.377 in)
Rim diameter	9.60 mm (0.378 in)
Rim thickness	1.14 mm (0.045 in)
Case length	44.70 mm (1.760 in)
Overall length	57.40 mm (2.260 in)
Case capacity	1.85 cm3 (28.5 gr H2O)
Rifling twist	178 mm or 229 mm (1 in 7 in or 9 in, originally 1 in 14 in)
Primer type	Small rifle
Maximum pressure (EPVAT)	430.00 MPa (62,366 psi)
Ballistic performance
Bullet mass/type Velocity Energy 4 g (62 gr) SS109 FMJBT 940 m/s (3,100 ft/s) 1,767 J (1,303 ft⋅lbf) 4.1 g (63 gr) DM11 FMJBT 936 m/s (3,070 ft/s) 1,796 J (1,325 ft⋅lbf) 4.1 g (63 gr) GP 90 FMJBT 905 m/s (2,970 ft/s) 1,679 J (1,238 ft⋅lbf)
Test barrel length: 508 mm (20.0 in) Source(s): NATO EPVAT testing, QuickLOAD, SAAMI, C.I.P.