just solder new ones on you could probaly get some one evike. airsoft gi. or weaponblender.
if that plastic part is whats getting hot i dont think buying a new one would change anything.
have a look threw
order from the asian site they have everything. its legit too.
they have so many cool guns that the us stores dont have. i would be scared to order one tho. im sure the people that inspect it to come into the usa would break it or throw it away.