EPeS Hop-up chamber for M249 Featherweight + HET nozzle

EPeS Hop-up Chamber for M249 Featherweight introduces a revolutionary design, developed after extensive research, combining high performance with simple control. This version is specifically designed for machine guns M249 with a plastic body and V2 gearbox, such as S&T, Cybergun, and others. Not compatible with A&K, Specna Arms, and other models with a classic "brick" type gearbox for M249.

Fine adjustment of hop-up pressure is possible within a range of 360° using the adjustment wheel, marked for easy orientation. The hop-up chamber is equipped with a perfectly tuned shape of internal seating for the hop-up rubber collar, ensuring successful testing with various hop-up rubbers available on the market (EPeS recommends Maple Leaf rubbers).

The chamber is made of aerospace aluminum EN AW 7075-T6 with surface treatment H+PTFE, offering not only high manufacturing quality but also optimal performance.
Additionally, it is possible to secure the chamber against rotation directly in the gun body using the included worm.

You will also receive a CNC nozzle HET with a length of 36.00 mm, modified threading to guarantee perfect feeding and performance.

Innovative Chamber Mounting
For precise shooting and trouble-free feeding, it is necessary for the chamber not to have the possibility to rotate around its axis. The chamber is standardly fixed against rotation in its axis using a groove in the gun's feeding chute.
An alternative option for fixing the chamber against rotation is to use a thread at the top of the chamber at the adjustment ring for hop-up regulation. Using the included M3×12 worm, you can fix the chamber in the groove of the central part of the gun's body. This option is particularly suitable if the option of quick removal of the outer barrel is not used. If you want to use this method of fixing the chamber to remove the barrel using the quick-change mechanism, the fixing worm must always be unscrewed first.
The third option (for example, due to access to the battery in the handguard) is to use the groove at the top of the chamber and fix the chamber directly in the part of the assembly holding the outer barrel. Modification of the assembly is necessary, but it allows fixing the chamber against rotation while maintaining axial movement in the direction of the pressure spring on the gearbox. This preserves the original function of quickly removing the outer barrel - this movement of the chamber is needed when locking the outer barrel into the gun's body.

Main Advantages of M249 Featherweight Chamber:

• Designed for M249 machine guns with a plastic body and V2 gearbox (S&T, Cybergun, ...)
• Fine adjustment of hop-up pressure - range of the adjustment wheel 360°
• Marked direction of hop-up regulation
• Perfectly tuned shape of the internal seating for the hop-up rubber collar - successfully tested with most available hop-up rubbers on the market
• Construction of seating for AEG hop rubbers with standard collar length (e.g. Systema), for use with a hop-up rubber with a longer collar, use the included spacer - more about the issue of collar length of the hop-up rubber
• Limitation of play of the hop-up chamber in the gearbox hole using the included O-rings of two sizes
• Vertically seated pressure of the hop-up rubber - works great with Maple Leaf hop-up rubbers
• Groove in the top of the hop-up chamber for the possibility of fixing in the outer barrel assembly
• Possibility to secure the chamber against rotation directly in the gun body, using the included worm.
• Exchangeable pin for axial locking of the hop-up chamber in the feeder - if necessary, a longer pin can be installed to ensure a perfect fit.
• Made of aerospace aluminum EN AW 7075-T6 with surface treatment H+PTFE
• Made in the Czech Republic

Package Contents:

• Hop-up chamber
• Adjustment ring for hop-up pressure
• Flush press roller of the hop-up
• 2× safety O-ring of the adjustment ring (9×1.5)
• 2× O-ring for limiting play of the chamber in the gearbox hole (6×1 and 9×1)
• 2× spacer for the collar of the hop-up rubber (0.1 + 0.2 mm)
• Fixing worms for fixing the barrel in the hop-up chamber (2× M3×5 + 2× M3×4 - belong to the top and bottom holes in the groove)
• Worm allowing fixation of the hop-up chamber in the gun body (M3×12)
• Nozzle 36.00 mm