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When the M1 carbines were updated with adj rear sights, was it common to seat the sight in the dovetail with what looks like a center punch? I was looking at one that had 3 very pronounced punch marks in receiver. The more I learn about these the less I seem to know. thanks
Yes, that was the Norm
Grandpa:
The actual term for this is 'staking', or the sight is 'staked' in-place. You may have heard this term in the past and will certainly hear it here in the forums. It was done with an ordinance tool similiar to a small center puch, but with a more rouned tip, to displace a little metal into the small notches on the edges of the sight base to secure the sight on the carbine. Once the sight base was set at the desired location to center it on the required line of sight (axis of the bore), it was staked to prevented it from moving due to firing recoil or just being bumped in use.
Staking was /is done to a lot of gun parts to keep them from moving during use, like bolt & screw heads to keep them from backing out due to vibration over time. Hope this helps.