I present to you an Upper type Black Mamba for AAP-01.
It is equipped with an M3 screw slot for the TDC, a removable lower Picatinny rail, and a 14CCW thread.

Type A: Designed for use with the original front and rear sights, original T-nuts and sight screws, or M3x6mm countersunk screws.
Type B: Designed for use with the original front sight and screw, original sight T-nuts, or M3x3x4 hot inserts with M3x6mm countersunk screws. The rear sight must be printed + fiber optic to be added, or you can use the Karasukaigan GhostRing sight.

Based on designs by Karasukaigan: https://www.thingiverse.com/Karasukaigan/designs 
Rear sight T-nuts by 3Iki : https://cults3d.com/fr/mod%C3%A8le-3d/jeu/aap01-rear-sight-t-nut-m3  
M3x3x4 brass insert (AliExpress): https://urls.fr/lnXyBs 
M3x3x4.5 brass insert (Amazon): https://urls.fr/4p2_Lz