Ruger 5.7x28 - Was a no brainer to add one of these...

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Is paramount too. I'm glad to see innovation in the gun world.

Many times the new cartridges get praised or bashed for little or no reason. Mostly by people who've never shot them, of course!!!

I think the over priced guns available hurt the 5.7x28 more than anything.

I'm really glad to see this gun and the Glock 44 this year.

NATO did a bunch of testing and found it inefficient and barrel eroding..here are their tests...

A series of tests performed by NATO in the United Kingdom and France indicated that 5.7×28mm was a superior cartridge.[8] The results of the NATO tests were analyzed by a group of experts from France, the United States, Canada, and the United Kingdom and the group's conclusion was that the 5.7×28mm was "undoubtedly" the more efficient cartridge.[8]

Among other points, the NATO group cited superior effectiveness (27% greater) for the 5.7×28mm against unprotected targets and equal effectiveness against protected targets.[8] It also cited less sensitivity to extreme temperatures for the 5.7×28mm and cited a greater potential risk of barrel erosion with the 4.6×30mm.[8] In addition, the group pointed out that 5.7×28mm is close to the 5.56×45mm NATO by its design and manufacture process, allowing it to be manufactured on existing production lines.[8] The group also pointed out that 5.7×28mm weapons are more mature than 4.6×30mm weapons, and the 5.7×28mm FN Five-seven pistol was already in production at that time, while the 4.6×30mm Heckler & Koch UCP pistol was still only an early concept.[8] However, the German delegation and others rejected the NATO recommendation that 5.7×28mm be standardized, and as a result, the standardization process was indefinitely halted.[1][8]