HW100Tuning  
     
   "Barrel Length to Shoulder" is the barrel length when the barrel is OUT of the gun to the threaded shoulder where the silencer/moderator sits.  
     
  The Carbine barrel is 290mm (to shoulder) as standard from Weihrauch.

The Rifle barrel is 390mm (to shoulder) as standard from Weihrauch.
 
     
  HW100Tuning