I am having a difficulty to mount the muzzle on my vz. 58 tight enough. Why ?

Unlike vz. 58 flash hider, vz, 58 muzzle break needs to be attached tightly on the muzzle in one specific position. Each rifles thread on a muzzle starts in slightly different spot and so does the thread on each particular muzzle break. Therefore each vz. 58 rifle bought from CSA together with muzzle break has the muzzle break hand fitted onto particular rifle. If the muzzle break is bought separately, fitting needs to be done by trained machinist or gunsith.