In the graded 20-gauge guns I've recorded snap-on/-off forearms through about the first 700. In graded 16-gauge guns I haven't recorded any guns in the 3005xx and 3006xx range and by the 3007xx range I see Deeley latches. Actually 300590 has a Deeley latch but it has been so completely CSMC'd that I don't count it.
Not to say I haven't recorded a handful of Deeley latches in these ranges.
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