Ordered a receiver extension for my ar15. Few days later received package with a 30 round clip. Sent 3 emails with no response, called three times waited in excess of 30 minutes for customer service. The first time I called I waited forty minutes only to say hello then the call was dropped. Second time waited thirty two minutes and the phone went to a busy signal. Third time got through after waiting 38 minutes and explained my problem. Hope things go better from here.