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[Carbine](https://en.wikipedia.org/wiki/Carbine) (*via wikipedia*)
>…carbines are shortened versions of full rifles, firing the same ammunition at a lower rotational velocity due to a shorter barrel length.
Kriss makes a SBR, as well though. The government has specific measurements of what a SBR is, too.
[Kriss Vector Carbine](http://www.kriss-usa.com/products/carbines/vector-crb-45-acp)
[Kriss Vector Short Barrel Rifle](http://www.kriss-usa.com/products/short-barrel-rifles/sbr-45-acp)