I stumbled across the Vuurwapen Blog today for the first time – and am I ever happy that I did!
Andrew, who runs the blog, has developed a calculator to determine what each thing you add to your AR-15 will weigh. For example, your basic M4 carbine configuration with a 6-position adjustable stock, Troy BUIS, Eotech 552 optic, Vortex flash hider, and a PMag full of 62 grain 5.56×45 ammo will weigh 8.525 pounds. If you decide you want the Vltor Clubfoot Modstock on it instead of the basic Tapco M4 buttstock, then the weight drops to 8.44375 pounds.
This tool is a great way to figure out in advance what hypothetical configurations will weigh without having to buy, assemble, and then weigh the weapon.
But wait! Andrew doesn’t stop there with his calculators. He also has developed a balance calculator that helps you determine the center of gravity of your AR-15. It helps you determine how the weigh will shift if you change various parts. He has a 3-part article that discusses weight and balance in AR’s.
If you have an AR-15 and you plan to modify it, you should bookmark these calculators. While you are at it, bookmark the Vuurwapen Blog as well.