I've had several, I see them as my subconscious mind preparing for various situations, plus I war game a lot when I'm awake and it must carry over. I'm always aware it is a dream and on several occasions have given myself a firearm or better weapons.
In one case I was walking down the street with my sister in a bad part of town. Two guys called her over, and for some dumb reason she went. They wanted her to try some of their cooked drugs, she said no, they pulled a gun on me. I was carrying, but knew I couldn't win with mine still in the holster, so I was watching for an opportunity. They gave her one last chance she said no and insulted them, they shot me in the thigh, it hurt, as I fell I thought a choice profanity and started drawing, woke up just before pulling the trigger. I was mad at her for most the morning for getting me shot
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Also had a dream where there was an intruder and for some dumb reason I left my Sig in the retention holster. I saw the front door was open, and saw a human shape in my living room. I saw him see me, felt him start to move to me and *KNEW* he needed to be shot but I couldn't get my gun out of the holster, woke up just as he hit me.
My wife had one where she knew someone was in the house but couldn't get her gunvault open so she was walking around with the gunvault entering the combination. Finally got it open and shot the guy but he wouldn't go down, she kept reloading until she was out of ammo / he went down.
One month we spent a ton of time at the range, and I had started shooting a little high and to the right. I had a dream a guy broke in and came charging up the stairs, I shot him 3 times and he collapsed. My wife and I walked up to him like we would approach a paper target, I could see the holes but no blood, I said "yep, high and to the right!"