1911freak

Nice setup, how tall was your spacer?

I mounted an EOTECH XPS3-0 sight and it is just too big so I'm looking into iron sight options before going with one of the mini red dots. I have an Ulimak rail atop my Saiga 12 and was wondering if anyone has ever used AR-15 type flip-up iron sights on thier Saiga. I understand that the sight radius is very short but it is a shotgun. I can hit center mass on torso sized gongs at 100 yards with a Glock so I was thinking that BUIS sights, even in a short sight radius, should work just fine. Also does anyone know of a rear sight that I can put on the Ultimak rail that will co-witness wit

When will these be available?

Another newb question. Exactly which ACE block would that be? They have several AK variants.