[Linked Image from i.imgur.com]

Collar on the Breech end. Seems the »O Rings«, seals, whatever are the key to the fitting of the Einsteckläufe, with the collar set appropriately to the chamber, just orient correctly and tap in..... I wonder how available those are?


[Linked Image from i.imgur.com]

»O Ring« on the 60 cm end.


Hochachtungsvoll,

Raimey
rse