First of all, the arrows work pretty well in every condition and even better with a longer barrel. The penetration is stunning, two thick layers of leather from my welding cape got completely pierced through. By mistake, that is, because the shot didn't release at first as the drum was not completely aligned. That was a bit of a shock. The quality of the 3d-printed backend is quite poor however, some moulding would have been better imho, and the flights do not stand for long. But they are not necessary anway. The arrow holder is a bit better but the material has low elasticity, so it bends open over time what makes the arrows come a little too loose. All in all, for the reduced price, its okay and fun to play with.