There's a lot of options here. For starters, you could simply buy rails to attach to the factory handguard, either on top or bottom, these rails come pretappered to generally match the tapper of the handguard.
The only rifle I installed a light on, I used the Magpul MOE handguard, and bought the magpul MOE handguard light mount (you buy it either right or left hand, your choice). It tucks the light in nice and tight next to the Front Sight Post.
Just piddle around with a quad rail type and mounting the light on the side of it, makes the light stick out quite a bit, didn't care for that configuration.
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Rod
M&P 22A, 40c, 15A, 15-22
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