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plain old stock TM upper hopup will sort you out. You could replace the hopup rubber at the same time...but not entirely necessary (I have spares on hand because I always seem to tear it taking them out..LOL).
From a complete hopup.
- back off the hopup completely (so that it is off). You can check that the hopup nub is not protruding down into the chamber by looking in the back end.
- pull the barrel out, the hopup rubber may or may not come out with it
- pull out the hopup rubber, careful not to lose the nub.
If the hopup you have comes with all the gears and springs installed, just put the nub in place (a small probe or even a toothpick helps to get it in the right spot...it goes perpendicular to the bore, laying flat in the cutout), the rubber over the barrel (there's an alignment slot in the barrel), and reinsert it into the hopup. A little pure silicone oil helps slip it in. Secure the barrel with the barrel clip (half moon clip that is missing in your picture).
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