Like some of you, I couldn't stand a gun over 9lbs with tubes, so I bought a set of 3 subgauge late K32 barrels for it. They are identical to the subgauge barrels for a K80 except for the springball ejector retainer. All the barrels matched my 12g barrel within an ounce. Personally, having had two tubed guns, I'll never own another tubed gun.
One of the lighter clays comp 12g guns is the 682 gold E. I have a 32" sporting that comes in at 7 3/4 lbs and feels like more like a 28" gun. Still, the 7lb 525 has better dynamics for me, even though not the quality of a 682 or the K80.