Because I created one on account the Iron Sights are based off of the Gewehr43, that way your sights and weapon will match up!

http://i51.tinypic.com/2w3cb4k.jpg

^Here is a picture of the weapon. Its barrel, Magazine, and charging handle are all very accurate to a real Gewehr43 which can be seen in this link.

http://www.hqhm.de/include/serverstats/images/Weapons/gewehr43_mp.jpg

Just download the .rar file from the link posted on the original .jpg image and extract the files! Then drag-n-drop the files to their associated folders and click "yes" when asked to replace the files.

Also, if people like this design, I might take up requests for future skins

(including any other object people would want re-skinned)