Igun Pro

One of my favorite games for iphone is Igun Pro. To me, this is the best gun simulation app out there and it is entirely free (HD version is not). The HD version is .99 but i got it for free during a short period of time that it was free (it may still be free). 

This app features well over 100 guns. It also features skins for almost every gun. Many of these guns have been updated and look really good with the HD version of the app. I have already purchased all the guns by downloading free apps from tapjoy.com which gave me free coins to do this. After all the guns have been bought, it is a little boring but is still fun once in a while. This app is really entertaining but does get boring after a while. One thing that the makers of igun will do is put attachments that you can buy to put on your gun.