11. As the locking ring turns, it cams the lugs of the door forward, pressing the door against the hub. 12. The Mark 6 gun was constructed of gun steel using a hoops, a locking ring , and Welin breech block. 13. Mod 6 relined Mod 2 with a uniform twist rifling along with a modified new chase hoop and locking ring . 14. The rotating locking ring door requires a safety interlock to prevent operation when there is any pressure in the autoclave. 15. This gun included a smaller chamber, a shell-centering cone, a single-slope band seat, uniform rifling, and a tube locking ring . 16. The Mark 3 added three hoop locking rings and contained a longer slide, while the Mark 5 had five hoops total. 17. It is good practice to incorporate the ability to reverse the door locking ring rotation at any time and without delay. 18. For example, some door designs are simpler than the locking ring type, having no notched cutouts at all in the locking rings . 19. For example, some door designs are simpler than the locking ring type, having no notched cutouts at all in the locking rings. 20. The breech end was further modified by being machined out so that it could accommodate a gas check seat liner locking ring .
