The A3 upper receiver assembly is made to mil-spec standards and includes a picatinny rail on the top, dust cover, and installed forward assist.
Pivot/Takedown Pin Size: Small pin - .250"
Material: Forged and mil-spec with type 3 hard coat anodizing and a picatinny rail on top
Q: Are the bolt carrier and charging handle included?
A: The bolt carrier and charging handle are sold separately.
Fit and finish are mil spec and worked great with my build. Fits well with my Aero lower.