It will take approximately 5 to 6 days depending on your locality. This is because according to their policy, they have a 1-4 day duration for processing of the order before shipping via USPS. For more detail, visit http://www.airsoftgi.com/shipping.php.
It took about two weeks for my product to arrive form Airsoft GI because they are in California and have a 1 to 4 day processing time. Typically I order from AirRattle.com because get my items in two days.