Sites Spectre Pistol

Hello All,

I could use some help putting this thing BACK TOGETHER. The manual it came with is worthless and can't find anything on the web about dis-assembly/re-assembly.

I got the upper back together; springs being a real pain, but can't get the lower trigger pack back on. Have tapped pretty hard and don't want to take the chance of damaging it by banging any harder.
Does upper have to be put back together AFTER lower is snapped on? It doesn't come apart that way.

Is there some trick to lining it up properly?

Please EMAIL if you know how to do this.

Thanks