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Colt Delta Elite, a Series 80 1911 in 10x25mm Auto, a fairly powerful cartridge, more powerful than .45 Auto, and pretty much the upper limit of what you can do with the 1911 without having to redesign the frame and stuff. Some people like to handload and push 10mm Auto to higher pressure territories, which the Delta Elite isn't particularly suitable for, normal factory ammo is the safer choice, someone who wants to load up much hotter would best be looking for another pistol in the caliber.
This is a new model with Novak sights.