The hour glass configuration of the frame is completely normal. Can't address the front plastic guides really without seeing it but they are just a guide to the metal guides up front, so I suspect they aren't an issue either.
The broken magazine guides are also somewhat normal or were for quite awhile. I think Kahr has since addressed that issue. You might have to remove a bit from the barrel feed ramp.
Many have also gotten Lakeline mag followers which help feeding and help with the breakage as well.
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In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
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