This is a remix of shrapnel33's design, I modified it so it can be used in the KRG Bravo with a Howa 1500 Barreled action and XL Spigot. The KRG Bravo for Howa 1500 has an aluminum block that the front action bolt goes into making the original design too long to fit inside the chassis if using the XL Spigot. If you don't plan on using the spigot you can use the original design and turn it around and it will clear the aluminum block and give you a little extra weight.

Print with spiral vase mode or 0% infill and no top layer then fill with lead shot and epoxy. I got about 10 ounces total weight added with #4 shot.