Thanks Mike.

I took some pictures of some that I have. The stock on my SC Rifle does have a round cut and an E in the barrel channel. It is a CMPicon rifle that was arsenal overhauled at some point. It has a boxed RIA/EB on the butt, so I can't say it is original to that rifle. It has stock pins rather than bolts. It is serial # 4,734,xxx.

The spare stock that I have also has the round cut and an E in the channel. It also has stock pins.

The O3A4 has a C stock with an S in the cutoff groove, square band spring cut, and a BA/JPL stamped over a faint, boxed FJA. Guess this rifle was built at Benicia Arsenal.

The NIB stock has a square band cut and only a W in the receiver area and barrel channel. Obviously it would have no inspector stamps.

I have more pictures in the link if anyone is interested.

O3A3 Stock ID pictures by Nushigak-Moose - Photobucket

Greg V