Great app. But no 5.56?

The most common round for an AR-15 is 5.56x45... And theres not an option for it?

In addition, Id love to see some more options for base firearms. But I do understand that this app is aimed towards AR-15 lovers. And I have no problem with that! But I think thatd be cool to have some more options. Id even pay for a few more honestly.

Robert Douglas McMillan about GUNSTRUCTION