Folks it works perfectly. I bought the CDNN deal for the Hawk around the holidays and bought a BU stock from Buds while they had them on sale. I just broke both down and installed the Hawk with absolutely no issue at all. I function checked the shotgun last week without the stock. Affter installing, there is a little plastic rubbing in the inside, but slides ok and will wear in with a little use just fine. The whole process took less than an hour. I also installed the Wilson Combat +2 mag extension and left in the original follower. Now the Hawk is 8+1 using 2 3/4 inch and 7+1 with 3 inch 12 gauge.
Someone will say, why not buy a used 870. If you know where I can get it for $139, I would have.
Full function test next week, but I don't see where there will be any issue at all.