Love the size and idea of the x10 compact. Can it be converted with a barrel and spring swap?
Will the 10mm mags work in 45acp

The P320-XTEN COMP is compensated not compact. It's got a full length grip frame with a 1" shorter slide with a compensator in the end. The grip frame and FCU would work, but to complete the conversion to .45ACP you'd need a barrel, slide and magazine. I don't think Sig is currently offering conversion kits for .45ACP.

My bad, it’s compact in the top with the 3.8 barrel vs the 5in of the standard xten. Does anyone know if the 10mm mags will feed 45acp? Like the Glock 20/21 mags. Barrel and spring I get. The only 320 45 compact barrel I see listed is 3.9in so it would block the comp.
Thanks

You will need a Compact/Carry .45 SLIDE, barrel, recoil spring assembly and magazine. The slide is currently sold out at Sig, so you would have to find one somewhere else. Every thing else is in stock, including full size 10 round 45 magazines. Or you could buy a new Compact .45 pistol for about $650. There's always some available on Gunbroker. It's probably not worth spending the money unless you can find a used one in good condition for cheap.