Gunfixr,
I'd check out a good 11.5" barrel. I've got a 12.5" upper that I run suppressed and that little 1" seems to make a negative difference in balance compared to 11.5" uppers.
For those that don't know, Gunfixr is an artist. He converted a stock saiga 12 into a beautiful select fire shotty with a 13" bbl. Works great with bird shot and high brass loads. He was also the original inventor of the upgraded gas plug for the saiga system.

