You broke the upper half of your hopup unit. Funny...(funny to me, not to you, sorry)...I guy brought me his rifle with the exact same break, as in identical break shape. Sorry, he took my last spare upper hopup.
Any stock TM hopup unit will work. Be sure it comes with the gears and springs...the piece that broke off of yours has one of the 3 gears that are needed.
You could use it as is...might get a horrible air seal problem, might be a pain to set and keep your hopup setting, but it might work.
Make sure the part that broke off isn't floating around in your rifle somewhere.
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