Knurling flat

What I did not say on my post above is that the knurl tool needs to overtravel the part being knurled so that there is a complete left and right handed knurl on the part being knurled, I think that the overtravel pieces were about 2" long at each end of the workpiece.
 
if you are just looking for some gripping surface, you can give them a cross hatch with a fly cutter. It requires a slow spindle speed and fast feed rate.
 
If it’s small like a mag release then a checkering file might be an option.
 
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