I need to purchase the optional Romeo1 adapter Packet . I need to mount a Romeo 1 on to a Echo 1 site .Can you help out ?

Referenced products: SOR11000, SOE11001, SOE11011

The Echo1 should already be tapped for mounting the Romeo1. You might try to remove the rear sight off of the Echo and see if the Echo screws will work. If not, the ones included with the Romeo1 may be shorter.