red dot for shotgun?

I have a BSA holosight on my 3 1/2 870 express
it has only 4 years of service and no more than 300 shots throw it, but zero never shifted and the big circle with the dot in center is exactly the patern of the full choke
 
If you want low profile look at the Burris FastFire, there is a mount that bridges it with the stock so its flush to the reciever. Small dot similar to the Vortex Sparc
 
I had a FastFire II on my 590A1 for a year or so. Held up fine. I find it gave a more open sight picture than the Micro or TRS. However, it has a very small bit of distortion which bothered me. I'm now running a Micro H1.
 
Who sells the Vortex or Burris. Any suggestions where to look for a good cost?
I wouldn't get the Burris, a friend had one on his 870, it will not hold zero after maybe 20rds!!!. He ended up with the Leupold prismatic 1X14mm hunting 30mm, DCD.

I hope this helps.
 
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