All have m8 thread. Choose from 19mm, 21mm or 24mm according to your need.
The PP750, PP700sa, M11 and M16/Diana Outlaw front gauge are all 24mm. The Bandit and Stormrider9with front gauge option) has two different sizes depending on year (21 or 19mm).
The Stormrider guage in the stock is 19mm