This is one of those in-depth articles that GQ puts out every now and then.

Anytime a cop in any jurisdiction in America wants to connect a gun to its owner, the request for help ends up here, at the National Tracing Center, in a low, flat, boring building that belies its past as an IRS facility, just off state highway 9 in Martinsburg, West Virginia, in the eastern panhandle of the state, a town of some 17,000 people, a Walmart, a JCPenney, and various dollar stores sucking the life out of a quaint redbrick downtown. On any given day, agents here are running about 1,500 traces; they do about 370,000 a year…

The National Tracing Center is not allowed to have centralized computer data… That’s been a federal law, thanks to the NRA, since 1986: No searchable database of America’s gun owners. So people here have to use paper, sort through enormous stacks of forms and record books that gun stores are required to keep and to eventually turn over to the feds when requested. It’s kind of like a library in the old days—but without the card catalog. They can use pictures of paper, like microfilm (they recently got the go-ahead to convert the microfilm to PDFs), as long as the pictures of paper are not searchable. You have to flip through and read. No searching by gun owner. No searching by name…

All the out-of-business records that come in here—2 million last month—are eventually imaged and organized according to the store that sent them. It might be 50,000 Form 4473s from one Dick’s Sporting Goods in some suburb of Cleveland. So, say you need to find one particular 4473 from that store. “We go through them,” Charlie tells me. “Just like photographs from your Christmas party, and we look through every one. Until we find it.”