Has anyone tried the Blackaces Folding Brace Assembly? It looks like a pretty innovative device to help stabilize a Shockwave. Since it is not a folding butt stock, it appears that it is still legal on a Shockwave. The strap goes around your forearm instead of the butt going against your shoulder. http://www.blackacestactical.com/_p/prd3/4665931042/product/shockwave-folding-brace-assembly I'm picking up my Shockwave tomorrow morning in 20 gauge and this will be the first modification I make. Your thoughts?