From Guns.com:

To shed some more light on the magazine situation at present, it really has been unprecedented in the last 5 days. During a roughly the 72 hour period from Sunday afternoon to Monday evening we sold the ‘average demand’ equivalent of about 3.5 years worth of PMAGS, and and an even greater amount of our Brownells magazines. We’re working like crazy to get these orders to you as quickly as possible.