Friend dropped in.....

[browningautorifle]

quite possibly strapped into the holder to retain them.

There were lots of brackets inside an AFV and they all had an exact purpose. That's why some things didn't fit too well, they weren't what was supposed to fit. You should have seen the 1976 issue Chev mortar trucks, by the time they arrived we'd changed ammo natures so NONE of the new crates fit. Anyway, everything had to be strapped down or it migrated to underfoot.