Step 1: Setting Measurements
> First you need to make sure that the programs coordinates are using the metric system to allow an easier flow from idea to physical object. This can be done by selecting the option in blender from the picture shown. If you do not see whats in the picture make sure that a properties panel is open and make sure that you have selected the Scenes tab. Making sure you do this at the beginning of the project will save you a lot of unnecessary hassle later on.
Step 2: Obtaining Measurements
> If you have a Tippmann 98 Custom and are following along you will need a 1/8 sized allen wrench.
The measurements have already be obtained with a tape measure and the rough model of the front grip and flashlight are in the blend file below. You can use these as guidelines towards building your own mount.