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I can't see much of a difference. The 503 looks nicer to me, its a little heavier (3ozs) with a "gas nitride finish" and night sights, other then that I don't understand the difference or the pricing being the same for both models.
Jason T.
9 years ago
With Glocks, a U in the model number means it was manufactured in the USA. A P int he model number indicates it was manufactured in Austria.
Becky T.
9 years ago