Does anyone know where I can find an AIWB holster for a 4516?

I'd check with lobogunleathers.com. They have an inventory that goes way back. Plus, they do quality work.

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Why duck?? It's a 9mm!

Try Dale Frickie, JM Custom, Keepers Concealment. Worst case scenario, buy a "neutral cant" IWB, and attach a Dr. Scholls gel pad to the inside bottom of the holster that rests against your body (this helps push the butt of the holster into your belly and aid in concealment). The Comp-Tac Q1 might work for this last-resort option.

JM was a no go. I'll try the others. Thanks.