As you can see in the link above...
I have a mossberg 835 with the pic rail and another extended rail on top. I have the ldi dbal i2 on a picatinny rail with an eotech behind just for backup so i can always check the laser before each hunt saves me money on shells...
I recommend that you locate the laser on a rail/receiver and not the fore end or barrel. Dedicate this gun just for the IR laser...
I use the eagletac ir because its inexpensive. you will need an ir on the helmet and the gun.
The dbal d2 (only tested 2 when it was first released) did not take the 3.5 dead coyote and #4 recoil.
I have fired over 100 rounds and the Dbal i2 is taking the recoil.
Some tips:
Make sure your gun does not have any open rail or sharp edges...i have cut my fingers when using the dead coyote at night with the laser...hold the gun tight..when using the laser you will have the tendency to use a light grip because you will be out of the shoulder mostly.
I use full choke because i can use buckshot, tshot and number 4 without the need to change chokes.....and at 10 yards while up in a tree stand you can easily miss...so practice....
Make sure nothing is hanging from the gun that will make noise at night. Instead of moving the gun I try to let them walk into the beam...Less noise and movement.
When i am up in the tree stand bushes,tall grass, leaves and tree limbs really get in my way...so i clear an area...
I've had foxes come out less than 20 yards in front of me while i was standing in the middle of the field with the caller, nv/helmet and ir laser on shotgun....I dont use it all the time but it has its purpose. Works great on raccoons.
hope that helps..