while perusing the stock at wolverine supply(cgn dealer), i came across 2 other options like this.
one is a surefire with a pressure switch of some sort, but they are very pricey($500-900).
and the other was made by CAA, and was 70 or 80 bucks,maybe a little more, but its switch was thumb operated at the rear so it wouldn't interfere with your finger wrap around.
as for a rail, i mounted an ergo tri rail forend on my grizz and i like it alot.