Does anyone know the grip circumference of the HK45? I'm posting these images for posterity.

HK USP Compact grip circumference


Canik TP9 Elite Combat grip circumference


Glock 20 grip circumference

I can measure my 45c this weekend and let you know.

My 45C is 5 11/16” toward the bottom with the bigger back strap installed.

Thank you Sir!

That means it will fit me perfectly with the smaller back strap.