Hello all,

Have a question for the experts.

Just bought a pencil barrel Colt front end. Will mount on one of two uppers. Wiil replace my 16" HBAR on my Bushy A2 upper or will build on new RRA A2 upper. Will front and rear sight align properly for zero?

Recall reading about F&R sight height alignment problems between Colt front sight tower and Bushmaster/RRA upper A2 rear sight?

Just need to know what to expect.

Thanks in advance.