A lot or a little?
The parents' guide to what's in this app.
What parents need to know
Parents need to know that Gun Builder is an app that allows players to create and customize their own weapons. They can choose the various parts (like sights, stocks, scopes, handgrips, etc.) that will be attached to form pistols, assault rifles, sniper rifles, or other types of firearms. Players can also "engrave" their guns with names or messages, and personalize them with colors or by applying a leopard skin. The created guns can then be fired at human-shaped targets in a virtual firing range. They can save their creations in a virtual weapon rack, but there's no way to share them online. This app makes it seem that playing with guns is a fun activity -- like a toy; this is an app for gun-loving adults only.
Is it any good?
GUN BUILDER offers a relatively expansive array of parts with which you can create a customized firearm. There are technically lots of ways to mix and match the parts and create unique weapons, but unless you're a gun aficionado, many of the parts won't appear all that different from one another. And the firing range mode is repetitive, growing quickly uninteresting. By allowing players to create "cute" guns (with say, pink or leopard skin coloring) and engraving their names on them, it ignores the dangers inherent in gun possession -- potentially sending the message to naive kids that guns are a toy to play with. This is not an app for kids.