I can actually see how bowed the trigger sear is in those pictures. It's supposed to lie flat at the top of the trigger assembly, not curved as yours is. Easy replacement part though. You have many options overseas. PDI, Laylax, etc make replacements although they're expensive (for what they are)
If you want to buy local buyairsoftparts.ca has the Deepfire sear set
http://www.airsoftparts.ca/store2/in...roducts_id=650
QC on the part isn't the greatest but you can replace both sears for the cost of one.