M1 Garand Rear Sight markings

[RCS]

Besides the excellent quality VAR barrels, you almost never see a Ferro Machine & Foundry M1 barrel. You would think by this point in
time some would have surfaced ? These Ferro M1 barrels (circle F) were shipped to Europe as replacements during the mid 1950's. I
once saw a Ferro M1918A2 barrel circle F and dated 5-56 and M1A1 cast butt plates by Ferro are around