I just recently got this.. Mako Group Vertical Fore Grip and Bipod w/ Integrated Tactical Light - model number is T-PodSLB. I'm trying to find the right flashlight to work with this unit.  It holds a 1in flashlight and has a button to turn on and off the flashlight. But the flashlight has to have the on/off botton on the back of it in order for the mako flashlight button to work since it's a little nob that pushes forward.  Any recomendations for a good flashlight that is compatible with this mako unit? Thanks for your help!

They have their own light or a standard Surefire P6 should work @1".  Solarforce may also work but it is a little slicker than Surefire so I'm not sure it will hold.
If a little loose your local hardware may have a rubber type tool dip substance that will work to add a little more thickness and grippy surface.