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Prometheus Stainless Steel 6.03mm Tightbore Inner Barrel with RHOP Installed (Length: 363mm)

ID: 61990 (BRL-Prom-Rhop-363)
Prometheus / Laylax859188619906BRL-PROM-363 + RHOP61990
4.5 stars, based on 13 reviews
Prometheus Stainless Steel 6.03mm Tightbore Inner Barrel with RHOP Installed (Length: 363mm)
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Prometheus / Laylax



  • Crafted from high quality SUS 304 stainless steel
  • Precision machined 6.03mm inner diameter
  • Polished internal barrel provides enhanced accuracy and range over stock inner barrels
  • Precision fitted high density rubber patch fitted to hop-up window and sanded flush
  • Improved air seal and back spin
  • Stabilized projectile flight
  • High tolerances for inconsistencies in Airsoft BBs
About R-Hop: R-Hop is a popular modification in the Airsoft community which a high density rubber patch is installed in the hop up window and then polished flat on the inside of the barrel to ensure perfect fitment. R-Hop improves the consistency of each consecutive shot, improves peak backspin and airseal and provides the user with higher tolerances to imperfections in the projectile. All of these features combine to offer the Airsofter a higher performing Airsoft weapon.

Manufacturer: Prometheus

Size: 363mm

Customized Product: This is a custom gun/product, replaced original parts are not included.


Dimensions: 363mm x 6.03mm
Length: 363mm
Compatibility: Most Airsoft AEGs
Material: Stainless Steel

  • 1)Custom inner barrel assembly. *Professional installation/tuning recommended
  • 2)Warranty covers manufacturer defective properties only
  • 3)Make sure to use this with a "flat hop" or properly modified bucking
  • 4)Take very good care of the r-hop patch and clean regularly

About Prometheus / Laylax

Providing products in the Japanese market for the better part of 20 years, Laylax is well known for their high manufacturing quality and precise tolerances. Their tried and true parts and accessories have led them to be the leader in Japanese airsoft engineering.

13 Customer Reviews

(Write a review)

by Erin J. on 08/14/2019
"I installed this in my Ak-47 dsg that shoots 350 fps. I paired with a G&G green bucking I am able to place headshots at 200 ft.
by al l. on 07/15/2018
"Easily the best upgrade for any rifle. I put one in my vfc 416, the gun is otherwise, internally stock. Came in under the fps limit for OPX milsim game, but i couldnt believe the range and accuracy! Cant shoot anything under .30's without overhopping, but I generally use at least .3's. From now on, when someone asks what should they upgrade on their guns, I'd say the rhopped barrels and dont worry about anything else!
by Kris C. on 01/11/2018
"Amazing barrel, can reach out to 450 ft with it

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