Even without the hope of any compensation, gun owners turned in 29 firearms in four hours Monday during the second and final Marin County gun buyback event at the Mill Valley Police Department, the district attorney said Tuesday.

Among the surrendered weapons were an AR-15 semi-automatic assault rifle with a high-capacity, 30-round magazine, and a device that resembles a ball-point pen but actually fires a single .22-caliber bullet that Marin County District Attorney Ed Berberian said is the stuff of James Bond movies.

Gun owners also turned in more than 1,000 rounds of ammunition, Berberian said.

On Jan. 15, gun owners from Marin, San Francisco, Sonoma and Contra Costa counties surrendered 827 guns and 1,500 rounds of ammunition at several collection sites throughout the county.

On that day, the county was offering $200 for each semi-automatic handgun or long gun that was turned in, and $100 for other guns.

The county had $43,000 in cash to give out, and Berberian said that within 90 minutes it was obvious the cash was running out, so he halted the cash payouts while there was still $7,000 left.

Gun owners who came in after that were given a total of $68,000 in vouchers that they were told they could redeem within 30 days.

However, Berberian said Thursday that the county did not yet have the money to pay the voucher holders, and that there would be no money or vouchers offered during the second buyback event on Monday in Mill Valley.

Berberian then announced a fundraising effort to collect money to pay for the vouchers, saying any donations would be tax-deductible. Minus the $7,000 in cash, the Marin County District Attorney's Office was short $61,000.

Two trusts in the Marin Community Foundation have contributed a total of $15,000, and the district attorney's office has received $2,000 in donations in the mail, leaving a deficit of $44,000, Berberian said.

Donations can be sent to the Marin County District Attorney's Office, Attn: Gun Buyback Program, 3501 Civic Center Drive, Room 130, San Rafael, CA 94903.

A hotline, (415) 473-2727, has been set up to inform those with vouchers about the redemption process, Berberian said.

"We are urging people to call once a week" for updates, Berberian said.

Feb. 15 has been set as the tentative date when those with vouchers will be able cash them in at the Marin County Civic Center, Berberian said.