IMO...if I owned a 14" Cylinder bore for shooting slugs and thinking now about buying a Mod barrel (to get tighter patterns with shot) I would contact TacOrd(Casey) and ask him how effective the VCS system is on a 14".
I'd rather have one barrel that can perform than two and having to "swap" out barrels. The 20" VCS modified Cylinder bore 590A1 I posted earlier shoots tight patterns @ 25 yrds with 00buck and very accurate with slugs.
Is the difference in recoil noticeable?