It sounds like something is restricting the barrels from dropping down completly just prior to the end of stroke. The barrels should drop down (assuming the gun is cocked) with no resistance. I'd try taking the extractor out and give it a good cleaning, then put a little oil inside the receiver well where the bell crank rides in it's cutout on both sides. If those two things don't fix the problem, I'd try and loosen the floor plate screws and give it a try. The cocking slide rides just under the floor plate and might be binding. If all else fails and you can take the gun apart, give it cleaning. Other than that or other suggestions from the forum, a trip to the gunsmith is needed.
Good luck
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