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5.56mm is the smallest "Standard" that is used in the US Military.

Rifle and Machine Gun Ammunition
.30-06 (Springfield, Garand, light machine guns)
.30 Carbine (M1 Carbine only)
.50 cal (heavy machine guns, tactical rifles)
7.62 mm NATO (M-14 rifle, M-60/M-240 machine guns)
5.56 mm (M-16 rifle, M-249 SAW)

Pistol and Submachine Gun Ammunition
.45 cal ACP (M1911 pistols, Thompson and M-3 submachine guns)
9 mm (M-9 Beretta pistol, M11 Pistol, many worldwide firearms)

Grenade Weapons Ammunition
40mm Grenade Cartridges

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Q: What is the lowest caliber round that is in use by the US military?
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Related questions

What caliber is 7.62 mm?

7.62 mm refers to the bullet diameter of the ammunition. It is commonly associated with the NATO standard round, 7.62x51mm (.308 Winchester), which is used in various military rifles and machine guns.


What is .30 caliber ammunition use for?

Hunting, target shooting, military, defense, offense, collecting


What is 5.56 ammo?

The military version of .223 caliber. Can't use it if your barrel is not marked 5.56.


What gun caliber should starters use?

Starters should use a gun caliber around .22. This is a small but accurate round which helps to teach the basics of shooting along with safety and control.


Can you use 9 mm caliber round for walther p99 40 sm?

No. 9mm and .40 are not interchangeable.


Can a Glock 19 use the 33 round magazine?

Yes, as long as the mag matches the caliber of the gun.


What was the caliber of the first official US military firearm to use metallic cartridges?

ABOUT .69 to .75 caliber. These were smoothbore muskets.


What caliber bullet does the German MP40 use?

The MP40 utilized 9mm bullets, in a 32-round stick magazine.


What is a 45 caliber?

A ".45 caliber" can be a gun that uses .45 caliber ammunition or it can be a round of that ammunition. There are several specific calibers of small arms ammunition that are all generally called ".45 caliber." They have bullets that are roughly .454 of an inch or 454/1000 fractionally. A famous .45 caliber is the .45 Long Colt, invented in the 1870s and still popular today. It is used in revolvers. Another caliber that is the same diameter but a lot shorter in length is the .45 ACP or .45 automatic Colt pistol. It was made for use in the U.S. military's Model 1911 handgun, and it is still a popular caliber today in that gun and in other handguns. There are some rifles and carbines that use .45 caliber ammo, too.


What caliber is a 5.7x28?

It's a new round developed for use in FHN's P90. It is much shorter than the 5.56NATO round. ATK Commercial Products, Inc. has an agreement from FHN USA for exclusive distribution of the 5.7x28mm SS197SR sporting ammunition. All military and law enforcement ammunition will remain only offered from FHN.


What is a 30-ot-6 gun?

30/06. A 30 caliber cartridge adoped in 1906 for US military use.


What rifles come in 308?

Several dozen different rifles- it is a very popular caliber for hunting, target shooting, and military use,