I would certainly stick with an M1 over and M3 or an M4. While I love my M2, there is no reason to drop an M1 in favor of an M2 if the M1 is working well for you.
I have hung all kinds of things off the M1 and the M2. Inertia systems "stall" with light loads and a heavy shoulder. The gun needs to be able to move some for the inertia action to work. I would not worry about putting a light on if you are shooting 3.25 dram and heavier loads. If you go 3 dram and under and lean into it hard, might have an issue. But 2-5 ounces of light out front is not going to make a difference. It is a light, a side-saddle, ammo, added up that creates the issues.
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