Hi, I recently bought a Weihrauch HW45. Really great pistol. Quite an early one as the serial number is 350948. My question is about the breech/barrel seal. Do all HW 45s have the same size breech seal? All the regular parts suppliers state there is only one seal and it hasn't changed. But my gun has a smaller seal. The recess it sits in is smaller than the 2 more modern guns I've compared it to, only by about a mm, but its enough to stop the std seal fitting. Has any one else come across this problem on a HW45. Thanks John.