The close resemblance to a smartphone is a cause of concern for law enforcement.
"In general, the concept of any kind of weapon that's disguised, so that it's not apparent that it's a weapon, would be cause for concern," said Bill Johnson, executive director and general counsel for the National Association of Police Organizations, told CNNMoney.
The gun would still require a concealed-carry permit, but Kjellberg says there is already interest in the product with more than 2,500 emails coming from people wanting to buy one. CNNMoney reports the gun will cost $395. Kjellberg said a semi-automatic version could be available by 2018.
Read more at CNNMoney.