William do you pound in the shim with the receiver together or apart. The two receiver screws if backed out give enough room for the installation. I don,t think taking apart the receiver to much is a good idea, screw holes get loose and the clam shell receiver will not stay as tight, my opinion. Great post. Have to get this 880 club going. Mike
Can't post any target pictures yet as I'm new to this forum.My just purchased 880S (Walmart $35.00) groups pretty good, 3 in a dime at 33 feet consistently If I do my part.Beeman laser pellets, five pumps,I did throw the stock scope in the trash without even trying it out, just to follow tradition right!Put a rather cheap Center point 4x32 on to get the above mentioned groups. I was surprised my Nitro 2 benjamin springer didn't destroy that scope.Still cant shoot the Nitro worth a darn.Cant shoot my beeman R-10 with a scope but It does pretty good with Iron sights and heavy pellets.The 880 out of the box out shoots them both btw...Will be watching you guys for tuning tips, thanks In advance....