It's not possible without modification on any pistol I've had experience with. In my opinion it's not worth it. You should not be able to accidentally press the mag release with your trigger finger on most pistols if you're holding it correctly. The USP for example is ambidextrous but the mag release is below the trigger frame and requires you to further push it DOWN (not into the frame like a 1911). It's almost impossible to accidentally hit it with your trigger finger.
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JG HK416
KWA USP
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