ICM starting porting various models 6 years ago. Mainly competion setting and now that porting has become popular we are happy to offer this service. Standard ICM ports include 3/4 holes and spacing/diameter that have worked very well across mutliple platforms.
*Note: porting will and can allow burnt powder to get on pretty much any surface. That includes, inside the slide, on your front sight (unless it's been moved behind the ports) and even still powder will go where it wants too.
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Impact does an excellent job! Scott went out of his way to keep me updated and helped point me in the right direction. Couldn't be happier. He's working on number four now. Thanks Impact!!!