GunsAmerica

Quick Look

The 5.56x45mm NATO cartridge was introduced in the early 1960s for military use. It balances lightweight design and effective range. Today, it remains a popular rifle caliber for self-defense, competition, and law enforcement.

Why It's a Top Choice

Light recoil for rapid follow-up shots
Widely available and affordable
Compatible with numerous rifle platforms
High velocity for flat trajectory
Effective terminal ballistics for medium game

Key Variants

M855

Standard military green-tip round used for durability and penetration.

M193

Early 55-grain FMJ round favored for training and civilian use.

Open Tip Match (OTM)

Precision-focused round for competition and target shooting.

77-grain MK 262

Enhanced match-grade load for improved accuracy and barrier penetration.

Competitor Comparison Table

Feature	5.56 Ammo	7.62x39 Ammo	.300 Blackout Ammo
Typical Velocity (fps)	3000	2300	2200
Energy (ft-lb)	1300	1200	1200
Typical Use	Self-defense, Duty, Target	Hunting, Duty, Target	Suppressed, Hunting, Duty
Availability	High	High	Moderate
Penetration/Expansion	Varies with projectile type	Generally deeper penetration	Effective in barriers
Popular Platform	AR-15 rifles	AK and variants	AR-15 with barrel change

Best Use Cases

Self-defense and home protection
Law enforcement duty and patrol
Competitive shooting events
Small- to medium-game hunting
Training and range practice

FAQs

Can I use 5.56 ammo in all AR-15 rifles?

Most AR-15 platforms chambered in 5.56 NATO safely fire 5.56 ammo. Verify your firearm's chamber markings before use.

What is the difference between 5.56 NATO and .223 Remington ammo?

5.56 NATO has higher pressure and thicker chamber dimensions. Using 5.56 in a .223-only rifle may be unsafe.

How does 5.56 ammo perform for hunting?

Effective on small to medium game with proper bullet choice; commonly used for varmints and deer-sized game.

5.56 AMMO for Sale