Editing Talk:970: The Important Field

In order to purchase a firearm in the United States from a Federal Firearms Licensee (FFL) you have to submit an official government photographic identification card (State ID or State Drivers license usually suffice), complete a Form 4473 Firearms Transaction Record to include such personal data as name, address, height, weight, ethnicity, age, birth date and Social Security Number or Tax Identification Number and submit the previous personal data from the Form 4473 to the National Instant Criminal Background Check System (NICS) which is administered by the US Federal Bureau of Investigation (FBI) and receive a "PROCEED WITH TRANSACTION" from the NICS in order to take possession of the firearm.

To pay for your firearm with a check you only need show two forms of identification one of which may just be your Social Security Card. 

To take possession of the firearm actually requires more stringent checks on identity then to pay with one by check. 

But other than that your right.