Hey Stinky,
Don't know if you may be interested but, I have an Adaptive Tactical Sidewinder VENOM magazine fed 12 g. shotgun system, 10 round circular mag., as new, 10 rounds through it. Quite something.Paid the same for it as you are asking for the IAB 45x70. Go on adaptivetactical.com for a look. Thanks.
BUGGY O'