I have the Streamlight HLX Pro on all my rifles and wanted something similar for the M&P 12. Went with the similar peformance Streamlight HLX because of the dual tailcap setup; a dedicated clicky tailcap and a captive remote tailcap (so no remote plug to back out of the port from 12ga recoil
).
Initially I'd planned on trying the remote on the vertical foregrip, but the latching remote switch is too long and the grip itself is contoured in such a way as to make attaching a flat remote switch very difficult w/o resorting to a permanent adhesive.
Then, remembering a remote placement experiment I'd tried on one of my X95's, I tried the remote switch on the left side of the foregrip. Due to the length of the switch, there was only one possible way to place & orient the switch.
I would have preferred a less textured area and a shorter switch so it could be mounted parallel to the mag tube, but this turned out surprisingly well.
Cable management was another possible problem, but it worked out very nicely with a small zip tie loosely holding the cable close to the barrel shroud. After some dry firing I have no concerns about the cable snagging or wearing when cycling the action.
This is an experiment, only time will tell if this configuration is worth keeping. If it isn't, my only other option I can think of is to replace the remote tailcap w/the clicky tailcap then take my hand off the front grip to reach the switch.
For anyone who plans on mounting a WML on an M&P 12 I strongly suggest using a mount that attaches to the M&P 12's top optic rail.
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