You're referring to the blow back unit...not the hopup unit (which is attached to the inner barrel).
Is it a stock TM plastic slide? If so..you've undone the screws properly. To "pull" the blow back unit out...you need to pull the sides of the slide apart and pop the unit out. To me...it feels like you're about to tear the slide apart...and then it comes out just as you're about to give up. Litterally feels like it's going to snap.
If you have a metal slide...what make is it?
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