UK system? World system!
A bit off topic: we are three guys that own S&W revolvers, Performance Center cobbled together by failed recovering Alcoholics.
Oldest one is 3 years, two (incl mine) are less than 2 years old.
They have one thing in common: All screws, including the one holding the muzzle device in place, are undersized and, unless glued in, loosen up within 50 rounds.
We have between us ruined two muzzle devices, lost around 6 screws and, the best one, managed to get a cracked frame ( we think the drum got misaligned to the forcing cone after the front screw holding the yoke ( holds drum in frame) got lost)
I would not remove a screw every time I came home from the range just to satisfy a faulty law.
Every time a screw is removed, both it and the other part, gets wear. Screws can be replaced, the other part ( frame) not.