These are the worst weapons an army could buy

People like to talk about the best tanks, rifles, and tactical gear. It's a great discussion — there are many sophisticated pieces of tech in the military world, each with various strengths and weaknesses. That said, we rarely talk about the flip side of this coin: What are some of the worst pieces of gear out there?

There are some weapon systems out there whose sole purpose in existence is to act as an example of what not to do. So, let's dive in, without restraint, and take a look at the very worst the world has to offer across several gear categories.

Worst Rifle: Heckler and Koch G36

Heckler and Koch usually makes good guns. The MP5 is a classic submachine gun that's still in service around the world. The G3 rifle was second only to the FN FAL. But then there's the G36.

Intended to replace the G3, the G36 was to be Germany's new service rifle in the 5.56mm NATO caliber. Well, the gun had many problems. First and most importantly, the gun was horribly inaccurate when hot. In temperatures above 86 degrees Fahrenheit or after firing many rounds, the gun was liable to miss a target 500 meters away by as many as 6 meters. Spray and pray is not a tactic known to successfully defeat an enemy.

Worst Machine Gun: Heckler and Koch MG5

Heckler and Koch has the dubious distinction of owning two items on this list. HK made the under-appreciated G8, which could serve as anything from a designated marksman rifle to a light machine gun in 7.62 NATO. The company's MG4 is a solid 5.56mm belt-fed machine gun — again, the company knows how to make good weapons. Unfortunately, they also made the MG5.

This is a gun that can't shoot straight. Granted, when you're using a machine gun, the task usually involves laying down suppressive fire, but it'd probably help to hit the bad guys occasionally.

Worst Tank: T-72

Two words: Desert Storm. This tank's poor performance speaks volumes. When it fired its main gun at a M1A1 Abrams tank from 400 yards, the round bounced off. Read that again: The. Round. Bounced. Off.

You can't get worse than that. In general, the best anti-tank weapon is another tank, but the T-72 is simply useless. Any crew you send out in this vehicle should be immediately considered lost.

Worst Artillery: Koksan self-propelled howitzer

This thing has a long range (it hits targets up to 37 miles away) but, for everything other than that, this gun is impractical. The rate of fire is not measured in rounds per minute, but rather by minutes per round — to be precise, two and half minutes per round.

Yes, it is self-propelled, but it has a very slow top speed (25 miles per hour) and it doesn't carry much in the way of ammo.

Worst APC/IFV: AAV-7

First, let's talk about the good of this vehicle: it can carry a lot of troops (21 grunts and a crew of three) and it has some amphibious capability. Unfortunately, those benefits are outweighed by the huge size, relatively puny armament (a .50-caliber machine gun and a 40mm automatic grenade launcher), and light armor.

The design is 45 years old and ready for retirement yesterday.