I checked out my Model 88 too. If you are referring to the where the non-reciever end of the magaizine joins the Take Down Mount/Take Down screw, I too have a 1/16" gap but have put many rounds through this gun for birds, trap, and skeet and have had no problems. My magazine and barrel are tight and the Take Down Screw can't get any tighter. (Purchased the gun new in Sep 06)

I think this is just a poor design versus what you'd find on a Mossberg 590 or Rem 700.

Have you removed the dowel from the magazine yet?