Rebuilt Engine, Super Low Oil Pressure :(

I always take apart my pumps before putting them on. Every one has had machining shavings in them. Just an idea, it could be the problem?

now that you say that it got me thinking... when they returned you the motor and or parts what was the deal? you assemble? was it assembled? I ask because if your assembling it you need to do a final clean on the block and parts as well as gauge everything.