whenever i get any neca figure, i immediately stick it in boiling water and take it apart joint by joint and reassemble it.I guess I'll try a little more pressure, the head on mine's almost stuck not being able to be fully upright.
I love the look of NECA figures, but I have had such a ^^^^ty experience with these Alien pieces, 3 Alien warriors to get one where the joints were so stuck they broke instantly, now possibly a screwed up Aliens figure. I had 2 Wolfs a Predalien and an Alien Warrior from AVPR before these with no issue. I've never had these issues with NECA until these two Alien figures.
it's the only way to be 100% sure they will not stick.
incidentally, my alien figure broke anyway.