Ok guys, back again...I was wondering about this Tanner Krolle cover gun mechanism on the suitcase lock system (that by the way is carried by Saudi Arabia King, and good british royals) and this is the mechanism...of course on miniature

The Blish Lock is a breech locking mechanism designed by John Bell Blish based upon his observation that under extreme pressures, certain dissimilar metals will resist movement with a force greater than normal friction laws would predict. In modern engineering terminology, it is an extreme manifestation of what is now called static friction, or stiction.

Breech-closure for firearms.
US 1131319 A
U.S. Patent 1,131,319

HOWEVER THE LOCK SYSTEM ON THE SUITCASE IS ROUND LOOKING LIKE THIS US PATENT 1867513 CARTRIDGE CASE