The WE P90 GBB is compatible with AEG triggers, however they're normally missing the stabilizer. This stabilizer allows for a snug, but smooth operation without any wiggle room. A fixed-size and an adjustable stabilizer is included.
This is the AEG trigger I have in my WE P90 GBB: link
Note
The adjustable stabilizer requires 2x M2 screws.
Note
Minor filing and sanding is required as the stabilizer is slightly oversized for a better fit. Remove a small amount and test fitment until it slides in with minimal resistance.
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