The OP isn't asking about dedicated Trap guns....
But a 29.5" being the optimal Trap gun, no way ....my personal preference for Trap is an Over Under that weighs right around 10 lbs ..with 32" barrels ..( and I prefer the Browning Citori, XT Trap model ) in that configuration.
If I wanted to shoot a single barrel....Browning BT-99 or Browning BT-100 then I would want at least a 32" ...and frankly a 34" would be better. I like the Browning BT-100 a lot ....but the best single barrel Trap gun I've shot is a Krieghoff KX-6 ...in a 34".
http://www.krieghoff.com/index.php/c...ngle-shot-trap