The modular barrel design takes into account the difficulty of machining long, high aspect ratio bores such as those seen in airsoft barrels. Rather than machining a single long hole, this design uses multiple short sections that will be press fit together. The resulting bore is much higher quality since the cutter's effective stiffness is significantly higher at these lengths, resulting in lower vibration and chatter. Cold hammer forging is one alternative, but very few can justify the drastic leap in price and marginal improvement in finish.