The X400 is the closest equivalent to the TLR2 that Surefire offers, both can be had with green lasers. The TLR2 used to be offered with a S&W specific rail key or adapter so that might be necessary to source if you want a Streamlight
My 459 has an aftermarket rail and Surefire X300T-A on it, so not particularly relevant. That said, Surefire X400’s should fit without issue. I have seen plenty of X300’s put on TSW’s with little to no modification, and the X400 has essentially the same body/housing as the X300. Some light fitting/filing on the tailcap may be needed, since Surefire no longer makes their tailcaps with an optional filler plate that could be removed.
Olds350rocket has an X300 on an integral rail gun that has zero issues
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