You could order a bolt knob and have it installed. I've got one on order from this guy:
http://www.boltknobsbybill.com/Styles.htm

I'm going to have my smith intall it, it takes a 5/16 X 24 threaded bolt handle. Any smith could probably make one and install it for you, probably looking at $50-70 depending on your area (thats custom knob and install, install only should be cheaper).

If you get the tact stock and bottom metal, stockys recommends the screws, but my fit and torqued down fine. I needed two smaller wood screws for the rear of the trigger guard and the rear of the mag bottom metal, but thats easy.

have fun