Talk:Weapon Proficiency

In this video of the Call of Duty XP Event the player uses a default class:

http://youtu.be/5xNhgegMv4U?hd=1

I noticed that this class has the Kick Proficiency but the G36C also has two attchments (AG36 Grenade Launcher and Red Dot Sight). How is that possible without the Attachments Proficiency?