Do all USGI 30 rd magazines have the front seam crimp? Also, I think I read that USGI mags were always blued, never parkerized...is that correct?
Jeff,
The early 30 round magazines had a full seam the later a partial seam. If you go to the link Charlie added here in post #3. Then look at the pictures in post #1 by thorin6 you will see the differences.