This a very nice set. The stock is a type E (trap door)
I only found 1 marking on it. I believe it is a C1 in a circle.
It is located on the notch that fits in to the lower receiver just below the buffer tube.
The pistol grip and hand guards are very clean and like the stock no cracks.
I am also going to add the following A1 parts.
Complete delta ring assembly A1 type.
Complete A1 rear sight assembly.
Tear drop forward assist, just the assist no spring or roll pin
A1 butt plate still in the wrapper.
(3) A1 butt screws (with drain hole)
M16 butt stock type D (non trap door)
Asking $90.00 shipped for all the aboveSold to tgus
I can accept US postal money order only