40 S&W PCC

A 40 S&W AR-15 can be built on a 9mm lower.  Barrels are a bit difficult to locate - here are a few sources:
Uppers & Barrels:
https://www.newfrontierarmory.com/product-category/barrels/ar-9-40-barrels/40-sw/

https://www.opticsplanet.com/new-frontier-armory-new-frontier-ar9-40-match-bbl-16-1-16-40s-w-black.html

https://shootinginnovationsllc.wpcomstaging.com/product/40sw-ramped-pcc-barrel/

https://moriartiarmaments.com/ar-40-.40-sw/ar-45-.45-acp-16-slick-side-lightweight-keymod-upper-half-with-ramped-bcg-and-charging-handle-ma45ureceiver-16

https://www.opticsplanet.com/cmmg-mkgs-40s-w-resolute-upper-group-receiver.html?_iv_code=2CM-URC-CP75-40B9894-CT

Lowers:
https://www.brownells.com/rifle-parts/receiver-parts/receivers/lower-receivers/complete-hybrid-mike-9-9mm-lower-receiver-prod145562.aspx

https://www.brownells.com/rifle-parts/receiver-parts/receivers/lower-receivers/ar-15-mike-9-complete-billet-rifle-lower-receiver-prod124109.aspx

https://www.brownells.com/rifle-parts/receiver-parts/receivers/lower-receivers/ar-15-mike-9-9mm-billet-lower-receiver-stripped-prod120143.aspx

Some ballistics:  http://www.ballisticsbytheinch.com/40sw.html
http://www.ballisticsbytheinch.com/images/vertruler.png

AR 40 Build Guide:  https://www.80percentarms.com/blog/ar-40-build-guide-/

 

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