I am putting together an A4 with scope to replace my A2 next service rifle season. I have a Bison Armory SR barrel, CL float tube and Bushmaster Upper. I am trying to figure out how I want to configure the gas block.
I have several gas blocks, a cut FSB, two A2 FSB and an A4 F marked FSB that can be used with the float tube. I want to be able to swap to a carry handle to shoot irons but mostly will use a scope. Can I use the A2 FSB?
One of the A2 sight bases have the post higher. I suspect the previous owner used it on a A4. I figured that could work since I planned to put a set screw under the front sight post to eliminate wobble. I figured the A2 base would be slightly lower and may show less in the scope.