Get the Trijicon front sight post.
I put one on my Bushy and just got it sighted in today at the range. I was 6" high an 4" left on my first shot.
Pretty proud that by the 3rd shot I was in the 10 ring.
BTW, I did also install the Trijicon Night sights on the ARMS #40 as well.
Very happy with the results.
SORRY: Edited to say the Trijicon front sight post IS taller that the stock Bushmaster post. Thought it would be clear when I posted that "by the 3rd shot I was in the 10 ring", but somebody questioned me on it.
Yes the Trijicon front sight post is taller than stock.