The monty is a great gun for the money. That sounds like a good price. My gun shop has them for $1075.00 right now. My cousin as a Monty and it cycles 1 oz loads all day long. There is something different between the Monty and the m2 but I can't figure it out. They just feel different with the sight plane. I like the Monty better than the M2 but the M2 as the tougher finish.
hope this helps
Novaking
the 11-87 supermag is junk, The benelli is not.
the 11-87 supermag is gas, the benelli is not.
the 11-87 supermag is easy to find parts for, the benelli is not.
the 11-87 supermag shoots 3 1/2, those to benelli's do not.
Cycle the action back and forth about 200 times. If it still continues or gets worse, stop and disassemble and try again. Come to think of it, you might want to disassemble it first to make sure assembled correct.
I have 2 novas and and Supernova and none of them have had that problem. I hope a little breakin does the trick.