Prometheus 6.20mm Delta Strike Barrel for Marui M4A1 / R.I.S. / SR16 / S-SYSTEM / SG551 (ALL+) (407mm) Net-Weight-(g)_192 POM Piston Head with Ball

POM Piston Head with Ball Bearing

Regular gear box design

Biggest and one of the hardest kicking handguns

Also Fit For Marui MWS 42mm Outer Barrel Base (16M) (MWS001)

Prometheus 6.20mm Delta Strike Barrel for Marui M4A1 / R.I.S. / SR16 / S-SYSTEM / SG551 (ALL+) (407mm) Net-Weight-(g)_192 POM Piston Head with BallPrometheus 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