Aside from learning of the replacements for the 4013/4006TSW's, I haven't kept up on any day-to-day developments with anyone from the CHP for the last few years.

Grip changes are often something authorized by agencies (like mine), with the restriction that it must be approved by the appropriate person, and it's installed by an agency armorer or an approved armorer/gunsmith. Things can easily vary from one agency to the next, of course.

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Ret LE Firearms inst & armorer