Prometheus 6.20mm Delta Strike Barrel for Marui M4A1 / R.I.S. / SR16 / S-SYSTEM / SG551 (ALL+) (407mm) reg_US this unit does not utilize

this unit does not utilize any bore obstructing "wipes" or mesh

Smoother Ver6 & 7

Marui Adjustable HopUp is located next to the ejection port cover0

Suitable For Maruzen P38 Series Airsoft Gas Blow Back GBB Pistol

Prometheus 6.20mm Delta Strike Barrel for Marui M4A1 / R.I.S. / SR16 / S-SYSTEM / SG551 (ALL+) (407mm) reg_US this unit does not utilizePrometheus 6. 20mm Delta Strike Barrel for Marui M4A1 R. I. S. SR16 S SYSTEM SG551 (ALL+) (407mm) High grade precision barrel at 6. 20mm diameter for extra power and precision shooting Suitable for Tokyo Marui M4A1 R. I. S. SR16 S SYSTEM SG551 AEG Rifle For custom upgrade user, you can choose a longer barrel PROMETHEUS EG Barrel by LAYLAX (JAPAN) This allows for precise, long range shooting, with 60 70 meter accuracy at under 1J. Length: 407mm