It would be pretty cool if the 40S&W barrel would feed from Glock 20 mags and avoid having to buy the smaller mag well.
A 10mm/.40S&W combo unit with 2 barrels and maybe 2 recoil springs could be good value.
I think the best value if you want conversions that require the two different mag wells, is to go for the full meal deal...... we just need some CDN dealer to be the first to offer it.