PROMETHEUS 6.20mm Delta Stike Barrel ( 229mm ) - for Marui MP5A4 / A5 / J / R.A.S/ SD series

- DELTA HOP system uses an injection molded part, with 2 lower ridges aligns BB in the center of the inner barrel, forming a 3-point contact along with hop packing for greater consistency.
- Low friction material used with enlarged hop opening for better compatibility with high firing rate configuration
- 6.20±0.01 mm inner diameter allows greater BB inconsistency,reduces BB bouncing

NOTE:
Prometheus Straight Chamber Packing and required ( included with first batch )
Recommended to be used with Prometheus Hop Up Tensioner series ( available separately )
Muzzle velocity may drop after installation compared previous inner barrel