A sixteen gauge shotgun is good for upland bird hunting. The graded 16ga A.H. Fox was the best sxs offered to the American Hunter. A good option would be old Birmingham made SxS that in 16ga can match weight of 12ga 2" game gun (about 5.5lb).
I prefer a 16 gauge to weigh more than five and a half pounds. Too much recoil for me at that weight.
I know this is an 1100 thread, but since it has been hijacked twice I will comment further.
In the 1960's my Dad acquired a used Fox Sterlingworth 20 gauge SXS 28" I/C-Mod barrels with extractors, double triggers, splinter fore end, and a hard buttplate. It weighed slightly more than 5 lbs (which was great for field work) but the stock had more than a 3" drop at the heel, making it hard to obtain a proper cheek-weld and also see the barrel rib.
The first time he shot it he loaded a round in each barrel, pulled the front trigger, and both barrels fired at the same time. He promptly took it to a gunsmith who repaired/replaced both sears, and it ran fine. I have been told that when that happens the recoil is not doubled, but rather it is squared. That might be an urban legend, I don't know, but he sure had a black left eye (as a southpaw) after that experience.
I shot a round of skeet with it and by station 7 my shoulder was ready to give up, even though I was wearing my usual padded shooting vest. The barrels also got a bit warm to the hand at the end of the skeet round because of the splinter fore end.
I am an 870 fan and my 12 gauge VR 26" I/C choke had a 2-3/8" drop at the heel with a vent recoil pad. Easy cheek-weld and could see the entire VR. Paid $110 for it in 1969 and it only had a few rounds through it. Mechanically and cosmetically it looked LNIB w/o the box. I owned an 1100 12 gauge 28" mod choke immediately previous to that and sold it to a friend of my Dad's for $100 who did not like his SXS for pheasants. It had a greater drop at the heel than the 870.
Any 1100 I would be buying, I would have to shoulder the gun from a ready gun-down hunting-carry position
numerous times before I would look at any other facet of the gun. A cracked fore end is easy to replace and as are minor rust blemishes. If you want it as a field gun, I would not worry about a pristine look. To raise the heel of an original stock requires judiciously bending the tang upward and refitting the wood to mate closely to the rear of the receiver. Doable, but much work.
Sincere apologies to the OP for the deviation but I wanted to link this post to yours.
Good luck with your 1100 endeavor, sir!
Jim