Question: How did Matrix know that the gun store had a hidden room full of illegal weapons such as automatic rifles, rocket launchers, and anti-personnel mines? There isn't any dialogue explaining how he knew the room was there and how he knew the general location of the hidden switch to open the room.
BaconIsMyBFF
6th Aug 2019
Commando (1985)
Answer: Most likely knew the store owner's tendencies or a scene cut from the movie that would have filled in the missing information.
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Answer: You are right that there is no reason given in the movie so any answer would be speculation. One possibility is it is a secret government (or criminal) arms cache which can be accessed in times of emergency and Matrix is connected enough to know about it.
He might have heard about it through the grapevine as gun guys talk. Notice how he fumbles around for the switch? That and the surprised look on his face when he walks into the secret room says he had never been in there before but had enough knowledge to know there was one.