Your mount will also be dictated by the way you intend to activate the light.
Do you have a rail system?
Are you using foreward vertical grip?
There are many types of mounts by numerous companies, there are inexpensive mounts available from the light companies themselves.
US made mounts are manufactured by
Elzetta
Larue Tactical
GG&G
Viking Tactics
Midwest Industries
Daniel Defense
Impact Weapons
and a whole host of others
The individual weapon mount you use will be dependant on the location of the light on the handguards and the way you want to activate it.