I ran a bottom line on mine,used automotive brakeline and 1/8 NPT to 1/8 flare fittings.
Old Automag ASAs have about a 15 degree(?)downward angle to them
The adapter from the stock ASA to flare fittings I had laying around from a trade,looks to be a common part,I dont have a source myself
Mine has a straight CP on\off ASA,Im able to sight my red dot without a riser with my mask on easily
If you dont want to bother bending brakeline you could always use macroline