The Mossberg 590 is a nasty recoil weapon (As is any 12 gauge) and because of that a weapons light must be able to withstand the sudden recoil. What you have to consider when you are placing a light on any weapon especially a pump action shot gun is that the light MUST NOT interefere with the action of the pump for obvious reasons in a fire fight. Because of this you have consderations unique to a shotgun of firs off how to mount the light. You can mount them on the barrel but the intense recoil coming down the barrel instantly calls for some very strong and durable mounting hardware. It must also be an insulated mounting for the light as to absorb some of the recoil and not pass it directly into the light itself. If there is no insulation in the mounting ring then its possible it would damage the light.
Another consideration is there are several pressure switch lights on the market that have a small wire running to the light itself but these prove to be challenging to mount on a shotgun as the ideal place to place these switches is where the shooter supports the front of the weapon with his hand. With the actions on a shotgun this makes this impractical due to the fact the pump will slide when utilized thus tearing the wire, the switch or damaging the light. placing the switch on the barrel poses a risk to the shooter because of recoil, heat and the impractical nature of attempting to control the firearm when the recoil comes down the barrel
The only real solution you would have is a steady burn light in which you would have to continue to reach up to the front of the gun to turn on and off. The reason surefire is so expensive with the Shotgun lights is because you are not buying just the light. You literally have to remove the entire pump action and replace it with one they supply that mounts the light directly in the front of the pump and slightly lower which helps to clear the baynotte mounting. These slides also provide the battery compartment as well.
Being a person in the law enforcement community and one who has unsed a Mossberg in tactical situations I STRONGLY encourage you not to go cheap with anything you do to make a weapon more reliable and dependable in a firefight. If it breaks or malfunctions then the results would not be ones you would want in that situation.
Another consideration is there are several pressure switch lights on the market that have a small wire running to the light itself but these prove to be challenging to mount on a shotgun as the ideal place to place these switches is where the shooter supports the front of the weapon with his hand. With the actions on a shotgun this makes this impractical due to the fact the pump will slide when utilized thus tearing the wire, the switch or damaging the light. placing the switch on the barrel poses a risk to the shooter because of recoil, heat and the impractical nature of attempting to control the firearm when the recoil comes down the barrel
The only real solution you would have is a steady burn light in which you would have to continue to reach up to the front of the gun to turn on and off. The reason surefire is so expensive with the Shotgun lights is because you are not buying just the light. You literally have to remove the entire pump action and replace it with one they supply that mounts the light directly in the front of the pump and slightly lower which helps to clear the baynotte mounting. These slides also provide the battery compartment as well.
Being a person in the law enforcement community and one who has unsed a Mossberg in tactical situations I STRONGLY encourage you not to go cheap with anything you do to make a weapon more reliable and dependable in a firefight. If it breaks or malfunctions then the results would not be ones you would want in that situation.