Here in brazil there are a lot of restrictions on cartridges.
5.56 = muh evil military cartridge!!!!!
.22 LR = ok civilian cartridge
I wonder if it would be possible to have a .22 LR gun, that was built to tolerate much higher pressures.
And if it would be possible to achieve near 5.56 speeds within the .22 LR cartridge size.
>INB4: no guns
>yeah, no guns!