The Stack-On 8 Gun Steel Security Cabinet features internal door hinges.
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I'm sorry to hear your keys are lost. Please call customer service to order new keys. (847) 665-1635
I would recommend reaching out to Stack-On directly for a copy of assembly instructions for their 8 Gun Steel Security Cabinet.
yes, this model is fully assembled.
According to the exterior dimensions this lock box is 10” deep, most walls are 3.5” deep in the framing, which means that it will not fit flush in a wall. Also notable is that this lock box is 21” wide, wherein most load bearing walls have a stud spacing of 16” on center, which means the space between the studs is only 14.5”, although newer homes usually have partition wall spacing of 24” on center, making a 22.5” stud bay, so you would theoretically be able to fit it between the studs of a non-load-bearing wall, if you could find one. Long answer but I hope it helps.