I am considering buying one of these. They differ some from each other. Sig: External extactor, accessory rail, little different slide "shape". SA: What I would call a normal 1911. This one has factory tritium sights, ambi safety, full length guide rod. I have owned an shot plenty of SA 1911's and I like them. I have never fired a Sig 1911, but I am thinking of giving it a try. Does any one have any experience with these Sig 1911's? Thanks in advance for the information.