for my election build, i have put together a a3 upper using dpms ap4 14.5" m4 bbl. i plan on using the fsb that came with the barrel and for the rear, LMT's tactical adjustible rear sight. do i need to replace the front sight post? and what size and where can i get one? or do i need to change the entire fsb? if so, im screwed due to the pin welded phantom!
i asked this question in the industry section with no luck!

Try to zero it as is. If that doesn't work then you can buy a .040 higher FSP from Bushmaster for a few bucks. Nice carbine btw.

thanks, so if i can't zero then .040 sight post from bushmaster is what i need!