I received my new extractor along with a new slide stop that I had purchassed as well but the stop is about 3 mm shorter than the original that I have, it barely comes out of the other side of the gun, is this correct? on the invoice said that is the same part number for 5904-6904-5944-459-559-59-6944da and so on.I got it on 5904 instead of 5906 due to the fact that the s/s was on back order and I like the black contrast, the difference betwen 5904 and 5906 should be only the color one being s/s and the other black. is it safe to use the new one being short like that? thanks..