The bolt is from a SIG 542 rifle.
Here are a couple of picture of the bolt and carrier.
A close up of the receiver with the bolt and carrier removed.
A series of pictures of the rifle.
These are close ups of the receiver area.
This is a comparison between the SIG bolt and a Russian bolt. Note the different locations of the cam.
I thoroughly enjoy “What is it Saturday”
I never seem to know the answers, but I learn more about the internals of less common/publicized firearm.
What is the reason that the cam is in a different location?
Are you working on building one of these like you are with the AR 180?