870P and a Messa side saddle.

The 6 round holder will fit no problem, the 8 round holder will require you to trim the Sure Fire forend a bit where it overlaps on the left side, about 1/4 to 1/2 inches.
 
You shouldnt have any issues. I have a 6 shot mesa on my 870 pmax and it never gave me any issuss, except when I put Remington police issue top folder on it. The I had to make a spacer plate to allow it to clear.
 
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