Mike,
If you are looking for a pump model without a disconnect, so that you might able to just hold the trigger down and continually pump and fire the shotgun (like the famous scene of Charles Bronson in Death Hunt), you may want to think again. If you try to fire a pump shotgun in this manner, you are much more likely to "short-stroke" it, and jam your weapon. Result: Your weapon is out of commission and you may be shot dead.
Just my opinion.
Big Paulie