SAN DIEGO (AP) — San Diego police received 164 guns during a no-questions-asked gun buyback event that proved so popular that officers ran out of the gift cards they gave in exchange for weapons.

Capt. Alberto Leos says $25,000 worth of Walmart gift cards were given out during the buyback Saturday in the department’s Southern Division.

He tells the Union-Tribune that officers had to turn away people hoping to exchange weapons for gift cards.

The newspaper says police handed out $150 in gift cards for every handgun or rifle turned in. Assault weapons netted $250 worth of the cards.

Leos said this weekend’s haul was bigger than a similar event hosted a few months back, which he said drew just 47 unwanted weapons.

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Information from: The San Diego Union-Tribune, http://www.utsandiego.com