Take a look at this build by Stupid Airsoft which is a 3D-printed bullpup SMG body kit for the AAP-01 airsoft pistol, a design by Tactical Index. He printed the multi-piece kit using durable ABS plastic and coated it with a truck bed liner for a non-slip finish. Key features of the finished product include compatibility with Glock magazines and a functioning bolt lock, transforming the standard pistol into a unique submachine gun replica.

The assembly process is detailed, involving gluing the receiver halves, installing threaded inserts, and integrating the stock AAP-01 as the core of the build. The creator praises the "genius" magazine release design but notes the expected slight mushiness of the bullpup trigger. Despite initial worries about gluing the pieces, the final construction is deemed sturdy, and he ends the episode with suggestions for hop-up upgrades to improve usability.