10.5" RRA sight compatibility

[Paulinski]

Thanks to Mark at Questar I will be receiving a 10.5" RRA Flat Top upper with fixed FSB. My question is will I have problems zeroing the upper with Troy Buis and factory FSB or will I need to swap the FSB for F marked one?

Thanks

Paul

 

[KevinB]

You can also buy an extra tall sight post.

 

[bear.23]

HIJACK in PROGRESS.....

Do we have a list or a link for the different sight posts ,FSB's and different length uppers... I now have a number of different uppers with a variety or different optics and irons.... haven't started sorting out the sighting yet....

For example what do I need to do to co witness an EOTECH on a 14 inch upper with an Arms 40 and an A2 FSB?

Maybe the list would be to long..