STORMBRINGER
I wouldn't call this a 2 piece, since it will need a 3/32in roll pin, and an extra Bolt Hold Open or comparable spring.
I just mashed the existing models together so as far as I know this is untested, if you're interested in printing this version of the Orca it would be a unique 1 of 1 firearm with no guarantee that it works as you would be the first to print and use it. If you want the files let me know and I will add a link here in the forum so anyone else can have it too.
Warning: This is a untested design use at your own risk. No guarantee the design will work. Any feedback posted back here would be greatly appreciated so I and everyone else knows how it turns out. Experimental Download