I have made upwards of 600 holsters with the Blue Guns, Red Runs and aluminum dummys. The Blue Guns are the best IMHO. They are not effected in the least by the heat at the temps used in molding Kydex.
The blue on the Kydex is from the final finish of the Blue Gun. It is a type of dye that is applied to even out the color after the casting is sanded and polished. You can order your Blue Guns directly from Ring's Mfg. with out the final finish.
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