95jza80tt, I am thinking of purchasing the Mesa polymer Sureshell side saddle that I believe you have. Did it add significant weight?
To reduce weight you could use the Magpul cantilever rail to mount a Streamlight TLR-1 to your MOE forend. This moves the weight back towards you.
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In an HD situation you do not want to leave the light on, but instead you want to momentarily light up an area that way you can confirm what you are shooting at without giving up your position. So having the light on the forend may be better for control of the light. Either way an HD shotgun should have a light for the sake of target ID.