Bud's will sell you the gun without the magazine, but they will not replace it with a 10 rd mag, that would be up to you. When you are checking out, after you choose your FFL, a box will pop up asking if you want the high capacity magazine removed.

10 round Glock 17 gen 5 mos version here
sportsmansoutdoorsuperstore.com/products2.cfm/ID/252320

Steven, I have heard from other members that if magazine capacity is the ONLY state restriction that some Buds personnel have offered to remove/replace magazines. I would contact Buds Customer Service to see whether or not they will at 1-859-368-0371 9am-9pm EST Mon-Fri. or use the Blue Chat now button at the bottom right corner 9am to 9pm Mon - Sat and 9am to 7pm Sunday.