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Quote from: running-man on April 05, 2026, 11:24:39 PMQuote from: Boris Badinov on April 04, 2026, 03:57:05 PMIts common trait seen on receivers with the right angle corners.
Scroll down to the Early vs Late receivers section at the weebly link below. Early receivers have scalloped corners and the marks are not present. Later receivers have 90° corners and the marks are present. Possibly they are from recoil, and not from intial milling but you'll find those marks on receivers with the right angled corner cuts. But they are nothing to be concerned with.
https://chinesesks.weebly.com/component-variations.html
Is the bolt even wide enough to make those marks?
Laugh, you know I've edited that weebly page more than once and many of those are even my photos, but I'm embarrassed to say that I never keyed in on the dimples on the late receiver innards.![]()
Looks like in addition to the different angle the inner face is maybe 0.050" farther forward as well. Carrier bottom kissing that face makes sense. That it happens so frequently that you noticed it Boris likely means you are correct in that it's not a cause for concern.![]()
It's always nice to learn something new!
Quote from: Boris Badinov on April 04, 2026, 03:57:05 PMIts common trait seen on receivers with the right angle corners.
Scroll down to the Early vs Late receivers section at the weebly link below. Early receivers have scalloped corners and the marks are not present. Later receivers have 90° corners and the marks are present. Possibly they are from recoil, and not from intial milling but you'll find those marks on receivers with the right angled corner cuts. But they are nothing to be concerned with.
https://chinesesks.weebly.com/component-variations.html
Is the bolt even wide enough to make those marks?