After spending an entire weekend trying to install this gadget, I have come away disappointed and frustrated. I have tried everything other members have mentioned and I can only get it to work with some stick mags. It stopped dead in its track once I tried using MD drums or Promag drums. I wish advertisement for this product would have been more transparent -- that this LRBHO requires MAJOR modifications to get it to work, or worse, that it would cost you over $200 and a trip to Mr. Cadiz to make it work. This gadget my made my Saiga ultra unreliable, a feature that I am sure no one desires