I have a Colt AR15A4 w/20" barrel. It came without a rear sight but has a factory front sight fixed to the barrel.
I have a rear Troy battle sight off a 16" barrel. What do I have to do to make it work on this rifle?
I also have a Vortex Strikefire II red dot, will it co-witness with the front sight right?
With the Troy sight on it, the large hole seems too large on the 20" barrel.
Thanks for any info that anyone can give me.
