cant put back part after disasemblying

i disasembyed (i have no &&^&^$^ idea how to write disasemblyed, sorry) the barrel of the gun and now i cant put back a white piece, i think the white piece is the piece that is supposed to hold the spring in place and also make it so that the gun shoots when you press the trigger, the problem is the white piece doesent stay in one place.

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