That's not an upgrade. It's a straight across replacement. Upgrading would imply you want to improve something. You don't improve on something by replacing it with the same thing.
If you're worried about the reliability of the gun, get it checked by a reputable gundoc. If it's not broke, don't fix it.
Otherwise, what would you like to see improved in the gun? Accuracy, Rate of Fire (ROF)? Range?
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