It was like that at first, but these days the standard practice is to use metal bolts, barrels and inserts for the parts that have to be strong. There were and probably still are fully printed guns like you describe, but it's far more common for a 3d printed piece to be a hybrid of plastic frame and purchased or machined metal parts
It was like that at first, but these days the standard practice is to use metal bolts, barrels and inserts for the parts that have to be strong. There were and probably still are fully printed guns like you describe, but it's far more common for a 3d printed piece to be a hybrid of plastic frame and purchased or machined metal parts