Well under 7

 

Closer to 6#

 

My 20 gauge 28" 687 SPII weighed about 5#15 ounces with the factory butt plate. It now weighs 6# 1.6 ounces with a 1" Pachmayr Decelerator pad added to the uncut wood for a 15 1/8" LOP.

There will be some variance in weight primarily because of the density of the wood will diffe.

 

Gonna depend upon whether it is a small frame or standard frame receiver and on how dense the wood is.

 

Most standard production shotgun models with wood stocks are going to vary slightly from one gun to the next usually due to density of the stock. I have three 20 gauge 686s including a SP1 all with 28 inch barrels. They range between 6 and 6.4 pounds. A SP1 with 26 inch barrels should be within that range but definitely under 6.6 pounds.