Really? Four ounces of weight won't make a difference in how a gun handles? And point shooting is an ineffective short-range combat shooting technique?
I can feel the balance shift after firing and chambering another round in my 20 gauge quail gun and it's even more noticeable in my "house" gun (an 870 Marine) with a 6 round mag. .......
I'm not saying lights aren't a good thing, but I much prefer them seperate from my guns.
The purpose of the light is target IDENTIFICATION, not target acquisition.
There's a certain amount of truth to the balance issue. I have to laugh when I see some junk festooned "Tactical" shotgun that must weigh 11 pounds, most of it clustered on the end of the muzzle. The things are so imbalanced that you could hardly hold one on target, much less follow one. However, we're not talking about shooting tournament skeet here either. If you are so sensitive that the imbalance caused by a 4 oz light is going to cause you to miss targets at HD range, then you had better leave it off.
BTW, how do you plan to hold your separate light while swinging your finely balanced shotgun?