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There's a bit of confusion about which is which,so this is basically a copy of what's currently on SA's website.
GI.45
Mil-Spec
Both models are available in stainless or parkerized. Hope this helps.
GI.45
All GI models are built with a forged frame,slide and barrel and include low-profile military sights,standard magazine well and spur hammer,standard ejection port,arched mainspring housing with lanyard loop,vertical slide serrations,hardwood U.S. grips and titanium firing pin.


Mil-Spec
A step up from the GI,the Mil-Spec includes many improvements utilized by the U.S. military during the 1911's years of service. These features include: High-profile 3-dot sights,high-hand grip,beveled magazine well,polished feed ramp and throated barrel,lowered and flared ejection port and angled slide serrations.


Both models are available in stainless or parkerized. Hope this helps.