If a Red dot site would help for Trap, then you would see champions of the sport use them.
I shoot competitive Trap, I even won a few times.
Only one person that I have ever seen was shooting with a Red dot.
He was a kid that wrote a letter to one of the companies that make them. They sent him one to try......Sat on his gun for about a week while he shot a lot of practice rounds, then he took it off.
The Kid is a real good Trap shooter and realized that it offered nothing for the game of Trap.
Save your money if you are planning on using one on your Trap gun.
Now for Turkey hunting, I really like mine!!!