Used, no forward assist, no deflector, small hole (0.250"), & M16/full auto sear cutout (see 2nd pic).
Markings up and right of ejection port:
#1 - C inside of square over a triangle
#2 - triangle with lazy triangle to the right
Looks like upper in this pic:
This picture indicates the difference for the M16/full auto sear cutout (will work with non full auto lower/trigger groups as well):
Priced at $75 each shipped or best offer. Email if interested. acloco@yahoo.com