Haven't had any gun related dreams in a long time. I used to, but never had trouble firing. Mostly it was finding myself either alone or with a small group of people trying to defend against a larger, more sinister, group. One of them had me out in a field on a farm at a picnic table with my family when a plane (WWII German) comes out of the air strafing and then, as I'm running to my house which seems to be a good mile away, the plane comes crashing down flat, skidding across the field in the same direction I'm running and I look to my right and see the pilot looking at me from inside the cockpit. I run upstairs in the house (but I've never seen this house for real before) and get my lever action rifle and ammo. That's as far as it ever got.
Most of my dreams nowdays have me in either a House, Hotel or on a bus, train, or boat with a bunch of friends and just ending up in a house or hotel that has strange floor plans and/or weird stair cases.