Classname for the 6.5mm suppressor is muzzle_snds_H, yet the entry for weaponSlotsInfo on the muzzleSlot is muzzle_snds_h for all rifles of the MX series and Katikba.
This inconsistency is causing problems with attachment detection, as primaryWeaponItems will return muzzle_snds_H whereas checking the weapon config will reutrn muzzle_snds_h. If the two need to be checked against each other, the check will not return true due to the difference in the last letter.
This problem is not present in other attachments.