Ken, sorry for so long to get back to you - got busy. Below are two averages of 20 gauge guns in my data base. There is actually a pretty strong break between the types. Note that there is little difference between the 12-2" and the Very light 20 gauge and, likewise, between the light 20 gauge and the light 12 gauge game gun.

Average very light 20 Gauge - 5# 8 oz, Bal to trigger = 4", Unmounted swing = 1.03, Mounted swing = 4.91, Bbl length = 26 9/16", LOP = 14 1/8", Compactness = 9.35

Average light 20 Gauge - 6# 6 oz, Bal to trigger = 4 1/2", Unmounted swing = 1.16, Mounted swing = 5.89, Bbl length = 26 5/8", LOP = 4 1/16", Compactness = 9.18

Hope this helps with the discussion.

Post back with any questions.

DDA