Fix gun compare

Correct show damage, armor-piercing, recoil and range.

Before:
![clipboard01](https://f.cloud.github.com/assets/4676406/1929866/0ec134c6-7e9f-11e3-8fd5-78ca122ae82a.png)
After:
![clipboard01a](https://f.cloud.github.com/assets/4676406/1929869/1b9e800e-7e9f-11e3-82d1-4982d8e6c376.png)

Before:
![clipboard02](https://f.cloud.github.com/assets/4676406/1929871/237c8f14-7e9f-11e3-979e-9a70cb2c20c3.png)
After:
![clipboard02a](https://f.cloud.github.com/assets/4676406/1929873/30f4fea6-7e9f-11e3-8959-56f3aaf92f8c.png)