Top two for concealed carry are the Sig P365 and the Springfield Hellcat. S&W Shield a respectable third.
For full size guns Glock 17 or 19 and the S&W M&P 9.
Springfield XD line not far behind.
European manufacturers are not keeping up with demand.
I could sell lots of HK VP9s and Walther PPQs if I could get them. FN has only been marginally better at delivering product.
I have a G-19 3rd Gen and love that gun. Not surprised it sells well for you.