Thanks, Kokanee.
I did lock it extremely tight with pliers and cloth. Thats definetely my mistake there. I ended up using the LePage gel super glue them together on the spare adapter that I have.
http://www.lepageproducts.com/UltraGelSuperGlue.aspx
Hopefully that will do the trick since I couldnt find Loctite in the nearby hardware store.
Agreed with you, I dont think they should even make the gas piston into 2 pieces.