Model 229R Convertible Rim fire Full Size Frame converts to 9mm/ blk Nitron fin.
These are p229R conversions from 22 LR to 40Cal/357 S&W. This offer will be available with a coupon to buy the 40/357 S&W Slide, Barrel, Spring Guide and Magazine - for one price.
I do not see the conversion kits listed. There may be one for the 9mm conversion. Since Sig is offering a coupon for the 40/357 S&W, I doubt that it is available yet. The conversion is for full size frame only. Don't see anything for Compacts.
The only other convertible is the Sig P250. Converts to/from 9mm,
.40, 357 S&W and 45 Colt. I have not seen the 45 Colt but may be available sometime this summer.