Ubr weight is excellent - Magpul Industries UBR Gen2 Collapsible AR15/AR10 Carbine Stock

This stock is outstanding for balancing out a rifle. It weighs a little more than smaller stocks and it helps make the gun less front-heavy, especially when running a suppressor or bipod. The storage compartment allows you to add additional weight if necessary. I have these on all of my ARs...adding a UBR is the first thing I do when I get a new rifle.