Hello,
It's been a long time since I started this post, but I thought I might introduce a little more concise method of identifying the five variations of Gen 4 M9s.
See if you can identify the pictures above with this better (IMHO) method.
The pictures above are not in the same order.
Marv
Gen 4 M9
Five variations
(in the first example: the B in PHROBIS lines up
vertically with the S in U.S.A.)
1. B/S wide USA flat sided O
2. B/S wide USA oval 0
3. B/S narrow USA
4. U/T S/P
5. I/A
Hope this helps