Winchester USA Ammunition 5.56x45mm NATO 62 Grain M855 Penetrator Full Metal Jacket (FMJ)

Short Product Overview

Winchester USA 5.56x45mm NATO 62 Grain M855 Penetrator Full Metal Jacket ammunition is a military-style “green tip” load designed for reliable performance in AR-15 rifles and other 5.56 NATO platforms. Built to M855 specifications, this 62 grain FMJ penetrator round offers dependable accuracy, consistent velocity, and smooth cycling for range training and tactical practice.

What Is Winchester USA 5.56 M855?

Winchester USA M855 is a 62 grain full metal jacket 5.56x45mm NATO cartridge featuring a steel penetrator tip (commonly identified by its green-painted tip). Originally developed for military use (SS109/M855), this load provides improved penetration compared to standard 55 grain M193 ammunition.

It is loaded to 5.56 NATO pressure specifications and is ideal for:

• AR-15 rifles chambered in 5.56 NATO

• .223 Wylde chambers

• Modern sporting rifles rated for 5.56 NATO

Always verify your firearm is rated for 5.56 NATO before use, as it operates at higher pressure than standard .223 Remington.

Key Features & Benefits

• 62 Grain M855 / SS109 Penetrator projectile

• Full Metal Jacket (FMJ) design

• Green tip identification

• 5.56x45mm NATO pressure

• Brass-cased, boxer-primed

• Reliable feeding in semi-auto platforms

• Manufactured by Winchester USA

• Excellent for training and high-volume shooting

Shooters searching for Winchester M855, Winchester green tip 5.56, or Winchester USA 62 grain 5.56 will find this load a dependable and cost-effective option.

Performance & Ballistics

The 62 grain M855 bullet offers:

• Improved barrier penetration compared to 55gr M193

• Stable performance in common 1:7 and 1:8 twist barrels

• Reliable accuracy at medium distances

• Consistent cycling in AR-15 platforms

M855 performs especially well in rifles with faster twist rates (1:7 preferred), which stabilize the slightly heavier projectile more effectively.

Typical Uses

• Range training

• Tactical drills

• High-volume shooting

• AR-15 platform practice

• Target shooting

While the M855 penetrator offers enhanced barrier performance, it is primarily used for training and general-purpose shooting.

Winchester USA Quality

Winchester USA ammunition is known for:

• Consistent manufacturing standards

• Reliable ignition

• Clean-burning propellants

• Quality brass cases suitable for reloading

If you’re looking for dependable 5.56 NATO 62 grain FMJ ammunition, Winchester USA remains a trusted option among civilian shooters and professionals alike.

Frequently Asked Questions

What is M855 ammunition?

M855 is a 62 grain 5.56x45mm NATO cartridge with a steel penetrator core, commonly called “green tip.” It was designed to improve penetration over the older 55 grain M193 round.

Is Winchester M855 good for AR-15 rifles?

Yes. It is designed for rifles chambered in 5.56 NATO or .223 Wylde. A 1:7 or 1:8 twist barrel is ideal for stabilizing 62 grain bullets.

Is M855 the same as .223?

No. M855 is loaded to 5.56 NATO pressures, which are higher than standard .223 Remington. Only use it in firearms rated for 5.56 NATO.

What does “penetrator” mean?

It refers to the steel core inside the bullet that improves penetration through certain barriers compared to standard lead-core FMJ rounds.

Is Winchester USA M855 reloadable?

Yes. The brass cases are typically reloadable using proper reloading equipment.