The owner of a gun shop in Tucson, Arizona on Monday refused to hand over an AR-15 military-style rifle that Mark Kelly purchased in order to demonstrate how easy it was to obtain assault weapons.

In a statement posted to Facebook, Diamondback Police Supply owner Doug MacKinlay said that he was blocking the former astronaut’s Second Amendment right because he questioned the political “intent” behind the purchase.

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“While I support and respect Mark Kelly’s 2nd Amendment rights to purchase, possess, and use firearms in a safe and responsible manner, his recent statements to the media made it clear that his intent in purchasing the Sig Sauer M400 5.56mm rifle from us was for reasons other then for his personal use,” MacKinlay wrote.

Kelly, who is the husband of former Rep. Gabrielle Giffords (D-AZ), said that he had purchased the rifle to show how easy it was to pass a background check. The effort was part of his push for more gun control in response to his wife’s shooting and other recent mass shootings.

A weapon similar to the Sig Sauer M400 was used last year to gun down 20 elementary school children in Newtown, Connecticut.

MacKinlay promised to refund all of Kelly’s money and raffle the weapon off to support the Arizona Tactical Officers Association.

Watch this video from CNN, broadcast March 12, 2013.