Dating springfield 1911 a1
The Mil-Spec .45 ACP can be had in the following variations.
I'm not an expert in this area, please consult with one. Don't know exactly, however it was probably made recently.
Springfield Armory® was the first 1911 manufacturer to offer a frame that included an accessory rail as part of the forging.
The Champion™ Operator® mates this forged Operator® frame with a shorter slide and a 4 inch barrel.
This allows for tighter lock up in battery and generally provides greater mechanical accuracy assuming that the bushing is tight.
Here you can see the stainless steel barrel in the Mil-Spec from SA.
Then slide your favorite tactical light on the rail, and put it on your nightstand.