Can one legally convert a SP5L pistol into a 16” rifle almost like a HK-94?
FWIW
https://www.thefirearmblog.com/blog/2021/03/11/hk-sp5l/
"As a reminder, to remain in complete compliance with federal laws, a few select foreign made components must be swapped for U.S. made components if you plan on turning your new SP5L into a rifle. Another option would be to swap this pistol end cap for a pistol stabilizing brace and avoid any 922r nonsense.
A 16.1” barrel seems odd on such an iconic receiver built to be a compact pistol caliber carbine. However, the move may be a way to avoid certain state laws and regulations surrounding shorter barrels. Or perhaps a platform for a competition gun? The question of “why” doesn’t really matter – these guns will sell out within minutes of hitting dealer’s shelves. If they even make it that far."