Description
Laylax Prometheus EG Barrel for Sopmod/M4A1/SR16/SG551 (6.03mm – 363mm)
This Laylax Prometheus EG barrel is a 6.03mm tight bore precision inner barrel, 363mm long, made to suit the M4A1, SOPMOD, SR16 and SG551. It is a straightforward upgrade from a standard inner barrel, designed to give more consistent shots and improved accuracy.
The EG series is Laylax Prometheus’s line of stainless steel precision barrels. Laylax bases the series on Tokyo Marui specification barrels and offers it in a wide range of lengths, so you can pick the exact length your replica needs. At 363mm, this is a common length for M4A1-type AEGs and several other rifles.
Stainless steel precision
The EG barrel is made from stainless steel rather than the brass or aluminium used for many stock barrels. Stainless steel is hard and resistant to accidental bending, so the bore stays straight even if the front end of your replica takes a knock, and it keeps its accuracy without relying on a coating. The 6.03mm tight bore gives the BB a close, consistent fit as it travels down the barrel.
One of the most popular lengths
363mm is a standard inner barrel length for many M4A1 and SOPMOD-style AEGs, as well as the SR16 and SG551. That makes this barrel one of the most widely useful in the range and a natural first upgrade for many M4 owners. Retailers report it being used in a range of M4 replicas from several makers, though fit always depends on the individual replica.
Fitting
Fitting means stripping the replica, moving the hop rubber onto the new barrel and reassembling. When you fit your hop rubber, check that it seats correctly in the hop window and that the nub lines up, as some hop rubbers and nubs fit differently from barrel to barrel. If you are unsure, ask a technician to fit it for you.
Key features
- Laylax Prometheus EG precision inner barrel
- 6.03mm tight bore
- Stainless steel construction
- 363mm length
- Made to suit the Sopmod/M4A1/SR16/SG551
- Resists bending and keeps its accuracy
- Made in Japan
Compatibility
Made in the 363mm length for M4A1, SOPMOD, SR16 and SG551-type replicas. Different makers use different barrel lengths and outer barrels, so check your current barrel before ordering; in some replicas a 363mm barrel may sit slightly beyond the outer barrel and be covered by the flash hider.
Before buying, measure your current inner barrel or check your replica’s manual, as length is critical: a barrel that is too long can protrude beyond the outer barrel or flash hider, and one that is too short may leave the BB unsupported in the outer barrel. Check that your hop-up unit and rubber are compatible with a standard Tokyo Marui-type barrel.
Care and maintenance
Before fitting, run a cleaning rod with a soft patch and a drop of silicone oil through the bore, then dry it so no oil reaches the hop rubber. After that, clean the barrel every so often, or whenever accuracy drops off, by pushing a dry or very lightly oiled patch through from the hop-up end. Always use good quality, seamless 6mm BBs, and never fire dirty or damaged BBs, which can scratch the bore or jam in the hop-up.
Who is it for?
Perfect for M4, SOPMOD, SR16 and SG551 owners who want a dependable stainless steel precision barrel as a first or long-term upgrade.
Please note: Fitting an inner barrel requires partial disassembly of your replica. Check your site’s power limits after any internal change, and always wear eye protection.
