Article by Ayoob about inserting a slide stop
The Infamous Idiot Scratch
On many a used 1911 pistol you will find a semi-circular scratch on the left side of the frame just beneath the rear of the slide stop. Where does it come from? Well …
A close-up shows the common “idiot scratch” on the frame of a 1911 pistol. It’s a cosmetic mark caused during reassembly. Image: Gail Pepin
Some of the manuals tell the owner that when reassembling the gun from a field strip they should just push the slide stop in when it’s in line with the appropriate notch on the slide. The problem is, the plunger is in the way. The user quickly figures out that if they start with the rear of the slide stop down under the plunger just a little bit, they can push
up and in almost effortlessly with the little stud on the inside of the slide stop pushing the plunger aside. And
voila, we have the idiot scratch.
The term “idiot scratch” came from 1911 purists. I’m not sure I can agree that it’s “idiocy” to take a shortcut to reassembly if the only damage it causes is a minor finish blemish, but if you want to avoid it, here’s how.
The photo illustrates a careful reassembly step on a 1911 pistol. The author uses a ball point pen to control the plunger while the slide stop is seated correctly. Image: Gail Pepin
You’ll feel like you need three hands, but you can do it. Assuming the pistol has the G.I. bushing configuration John Moses Browning designed, just leave the spring hanging out from under the bushing for now, bring the slide back as shown in the accompanying photo, and use a small flat-head screwdriver to hold the plunger back as you insert the slide stop straight in until it is seated. I’ve found the tip of a ball-point pen works well in lieu of the screwdriver.