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The Beretta 304 is limited to 2 3/4" shells while the 390 will shoot either 2 3/4" or 3" shells. Therefore, the 304 does not have the compensating gas spring. There may be other differences, but I'm not sure.

Since 390's are so common and fairly inexpensive, I don't understand why you don't just buy another 390 if you want a backup gun with interchangeable parts.
 
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