I have a FAL rifle with a Imbel lower and DSA upper.Its an 18 " barrel.It has a DSA picatinny dust cover along with a Mag pul PRS-2 stock.Im looking to put a scope on it one of low power 2-5 or 1-6 variable or fixed.I want to keep the iron sights .Can anyone suggest a scope and rings .I was wanting a one piece ring set up.But any recommendations would be appreciated.