4.6mm or 18 caliber?

there is a lot of stuff I haven't heard of ,and .18 caliber is one of them :?
 
Yup the link works now, just wanted to know if you guys ever played or seen one.

This is all I came up with

The 4.6x30mm cartridge is a type of ammunition used in the H&K MP7 Personal Defense Weapon (PDW) and by the H&K UCP pistol. It is designed to minimize weight and recoil while increasing penetration of body armor. It features a bottlenecked case and a pointed, steel-core, brass-jacketed bullet.



http://en.wikipedia.org/wiki/4.6x30mm




4.6x30mm%2C_5.7x28mm%2C_.30_M1_Carbine.jpg


From left to right: 4.6x30mm, 5.7x28mm, .30 Carbine
 
I thought it was neat... :lol:
 
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