All sales made through hiperfire.com are final. To place an order, these terms must be agreed to. The only returns accepted are those made under warranty that covers problems with material and/or workmanship. In these cases, once the product is returned and inspected, it will be replaced.
Having said that, perhaps something is wrong with the trigger. Please see the Trouble Shooting Guide to learn if there is some installation or other issue related to its performance that can be easily remedied