I just checked my 870, and it works like it's supposed to. I've shot Ithaca, Mossberg, Remington, and Winchester. All except the Winchester will lock up untill the rearward pressure is released (I understand that Winchester Model 12's, and older Ithaca does not). My Winchester has a rotary bolt, and doesn't lock up like the Mossberg, or Remingtons. The Winchester and Benelli's are designed that way for faster pumping. The Winchester are sometimes refered to as Speedpump.
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