I shot the first one of the year last Saturday. Shot my 92LTT w/ a TLR2G light and green laser combi unit. Had problems w/ the light going off during recoil. I had added length to the right side switch by drilling into and JBWelding a grip screw and nut on. That gave me about a 1/8" extension. Here it is w/ the screw removed but an extra nut on it to simulate the total length.
All I can figure is that having the left and right sides a different weight, somehow the recoil impulse imparted a force that, acting on different weights, rotated the switch. So I have removed the screw but left the nut. Hopefully getting the sides nearer equal will get rid of the rotation. I will find out this Sat PM.
BTW, if you haven't shot a night match, you are missing a really fun time. I have a cheapy three AAA flashlight on a lanyard around my neck. It shines on the ground for walking and I stick it between my teeth for loading mags, pasting targets, etc. I have a couple other flashlights w/ me but this $6 light from Lowes is all I use. In between people actually shooting, everyone has similar flashlights. But when called to shoot every one except the RO turns their light off. The RO light gets you to the line, and through the make ready and reholster part. Then his light goes off and it is DARK. As soon as the buzzer goes off, out comes the gun and on goes the light. I think the TLR-2G is 200 lumens which is more than enough. The 3 previous years I used a Crimson Trace L and L which I think is 100 lumens. It was fine too. This Sat our IWLA night match is 3 stages pistol only and 3 stages 2 gun. This will be a blast as the 2 gun stages are 30+ rnds and a couple of the pistol stages are 25 or so rnds. Yep, not official idpa. This will be my 3rd 2gun w/ the S&W FPC carbine but now w/ laser, and light added to my usual dot sight. In general these two night matches are my favorites of the year.