For these applications, flush bolt
slot systems are appropriate, says Folsom.
The annular bolt face that used to encircle the cartridge head and a plunger ejector are gone; in their place is a flush bolt
face -- the bottom half of the face anyway -- and an extractor that allows the top round in the magazine to become captive to the extractor as it clears the feed rails, just like on a Mauser, Ruger 77 MK II, or a Winchester Model 70 Classic.
"The machining center cuts slots for hinges, locks, flush bolts
and other hardware," Reichwald says.
Double-timber French doors have three-point security locking and flush bolts
. You will need to prepare your own base, but there are no brick walls to be built.