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The rear sight tool is a small investment to make and I would adivise you to buy one. If you dont want to buy one, you can put the reciever in a vise(between two wood blocks) and tap that adj (left...

That carbine appears to have had a flip sight on it in the past. Notice the way the outer edge of the right side of the dovetail appears to be dinged a bit. Its great that it doesnt have typical...

Could post a picture of the rear dovetail on yours? Here is a pic of an adj sight on an 3.8 IBM, i believe it to be original. The staking is different than most. Anyway, looks like a nice IBM you...