fountain valley calif the weapon module is threaded at one end to mate with the lens retainer 16 the lens retainer houses a lens 32 for narrowing the infrared beam as is well known in the art the lens can comprise one or more lenses to control the aberration and diffusion of the infrared beam referring to fig1 and fig3 the adapter 46 surface forms rails 50 for ease of mounting the weapon module 12 the adaptor is attached to the weapon 39 s trigger guard 52 with the mounting plate 44 and the four screws 42 the rails 50 allow the weapon module to be mounted or removed a locking mechanism not shown is provided in the adaptor 46 to retain the weapon module in position a release not shown on the adapter connects with the locking mechanism to unlock the mechanism so the weapon module can be removed in the exemplary embodiment the weapon module is attached by sliding the module onto the rails and manually applying pressure until the module locks in place the module is removed by pushing upward on a release and sliding the weapon module from the adapter it is to be appreciated that a wide variety of adapters are available for mounting the weapon module furthermore many weapons now come with suitable integral mounting rails.