I owned a Kahr MK9 a few years back but decided to sell it.
I'm looking that their website and it says that the overall length of the gun is 5.3 inches while the Rohrbaugh is 5.2 inches in length.
Again, I no longer have the MK9 to do a side by side comparison but if memory serves me correctly, there HAD TO BE more than 0.1 inches difference in length between the MK9 and the R9.
Anyone know of any side by side comparison photos?