No, the receiver has completely different internal dimensions and would not accept one. Also, the buffer tube is not actually a functional part. Which it would need to function.
1 either that is the most overbuilt rifle ever built or
2 its got a lower where you can put a 223 upper on top (like an AR platform) or
3 the sales man was treating you like a newb motorcyclist stating Sure the Hyabusa is a good starter bike or something to that effect
22lr to a 223 while not a big diameter change has an incredible change in chamber pressures
Ofcourse relatively easy to a master gunsmith is damn near impossible for someone with my skill level so who knows what perspective he was talking from