Prop M4 Barrel Alignment Pin

thingiverse

I didn't like the barrel being held together with just glue I felt it created a weak point that would break the first time any stress was put on it and it was a hassle aligning it during assembly. Print the pin laying horizontally for a stronger piece. If it's printed vertically it has a chance to break along the layers and will require drilling out the barrel to remove it. It may require a bit of sanding to fit.