The Winchester USA M193 5.56x45mm NATO 55gr FMJ (brand part no. WM1931000), sold by the full 1,000-round case, reproduces the original military M193 ball specification that defined 5.56mm performance for the M16 and its descendants. Winchester loads the 55-grain full metal jacket to mil-spec pressure for positive functioning and good practical accuracy, with brass cases engineered for clean, consistent extraction over long sessions. Among rifle ammunition, this case favors AR owners who put serious volume through their rifles and want the specification the platform was designed around.

Key Specifications

• The chambering is 5.56x45mm NATO, loaded to true M193 mil-spec pressure.
• The bullet weighs 55 grains, the original M193 ball weight.
• The bullet is a full metal jacket, built for positive functioning without expanding.
• The M193 specification is the standard that originally defined 5.56mm ballistics.
• The cases are reloadable brass.
• This listing is a full 1,000-round case, sold complete rather than in single boxes.

Frequently Asked Questions

Is this safe to shoot in a .223 Remington rifle? This is a full-pressure 5.56x45mm NATO M193 load. It is safe in rifles chambered in 5.56 NATO or .223 Wylde, but it is not recommended in rifles chambered specifically in .223 Remington, which are built for lower pressure.

What does M193 mean? M193 is the original U.S. military specification for 55-grain 5.56mm ball ammunition, the standard this Winchester load is built to match.

Is a 1,000-round case a better value than single boxes? Buying the full case keeps cost per round consistent and cuts down on reordering during heavy training.

Buy Winchester USA M193 5.56 NATO by the Case

The M193 specification built the reputation your AR-15 runs on, and this case brings that same standard to your range bag. Order from our Lubbock, Texas gun shop and it ships fast to your door.