Grips should be installed by a qualified gunsmith.
They are not intended to be "drop in" ready for installation.
Work may be required to fit to your pistol.
Raw aluminum grips should be anodized for surface hardness and wear resistance. Other coatings may be applied over the anodizing.
Stainless grips do not require a finish but please note that they are stainLESS not stainNONE steel. They can still rust if not treated with the proper care and cleaning.
Modification of your firearm may void the manufacturers warranty.
BUL pistols require a conversion to use grip bushings in order to fit our grips.