659 – Ten round magazines

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Looking to buy a few.

Where can I find some? I have two ten round magazines made by Mec-Gar but sometimes they fail to fire on the last round unless you push up on the magazine. The mix of older magazines that are original 14-15 rounders work very well. So I know it is not a worn Magazine Disconnect Lever in the pistol. Just want to get a few more magazines.

Thanks
Roy