I installed red, yellow, lime green, orange and white inserts over the years for numerous LEOs in the Birmingham, Alabama area.
A toothbrush handle makes a good source for inserts.
A toothbrush handle makes a good source for inserts.

I used to own this 28-2
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Sure looked factory to me.
I have a 66 no dash,former leo gun with a yellow insert,it shows a special order number on the box