This model set turns an Action Army AAP-01 into a M3 Predator from Mass Effect. The pieces attach to the AAP-01 with only a few bolts and no modifications to the pistol itself are required. The handguard slides and snaps into place around the grip for a secure fit.
In addition to the printed pieces you will need ten M3x10mm bolts. The two handguard pieces should be glued or welded together after printing.
This set includes eleven models in .stl format. Some of the models have versions that are split into multiple parts to reduce the need for supports.