I'm just wondering about this...I'm looking into buying an AR on one of the main websites to send to my FFL. And the ones that come with a 10 rounded are much cheaper. The state I live in doesn't have a mag cap law, so I'm wondering, if I buy the gun, can I just buy a regular mag and still use it in the gun? Or is there something in the actual magwell or upper that will prevent from accepting the mag. Stupid question I'm sure to a lot of you, but forgive me. This is my first purchase.