Epes M249 hop-up chamber

The ultimate hop-up chamber for the M249 machine gun for maximum performance and accuracy of your weapon.

The unique construction allowing the use of standard AEG hop-up rubber bands in combination with a perfect design and many improvements for maximum performance, reliability and user comfort will allow you to get the most out of the weapon. Precision production on CNC machines and H+PTFE surface treatment ensure the highest quality and durability. The unique design, which is the result of a long development, offers a combination of high performance and simple control.

• Designed for M249/MINIMI brands A&K, P&J, CA
• Fine adjustment of the pressure of the hop-up - the range of the regulation wheel 360°
• Marked direction of hop-up regulation
• Perfectly tuned and long developed internal fit shape for the hop-up rubber collar - successfully tested with most available hop-up rubbers on the market
• Fitting construction for AEG hop rubber bands with a standard collar length (e.g. Systema), for use of a hop-up rubber band with a longer collar, the enclosed spacers can be used - more about the issue of the collar length of the hop-up rubber band in the article.
• Delineation of the clearance of the hop-up chamber in the opening of the gearbox using the enclosed O-rings of two sizes
• Vertically seated hop-up rubber pressure - works great with Maple Leaf hop-up rubbers as well
• Groove in the upper part of the hop-up chamber for the possibility of fixation in the storage of the outer barrel
• The possibility of securing the chamber against rotation directly in the body of the gun, using the attached worm.
• Exchangeable pin for the 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 aviation duralumin EN AW 7075-T6 with H+PTFE surface treatment
• Made in Czech Republic

Package contents

• Hop-up chamber
• Hop-up pressure regulation ring
• Fitted hop-up pressure roller
• 2x safety O-ring of the regulation ring (9x1.5)
• 2× O-ring to limit the clearance of the chamber in the gearbox opening (6×1 and 9×1)
• 2× distance washer of the hop-up rubber collar (0.1 + 0.2 mm)
• 4× worm for attaching the barrel in the hop-up chamber (2× M3×5 + 2× M3×4 – belongs to the upper and lower hole in the groove)
• Worm for fixing the hop-up chamber in the gun body (M3×12)
• Longer pin of the axial locking of the hop-up chamber in the feed shaft

Perfect fitting for the hop-up collar

The shape of the internal fitting for the collar of the hop-up rubber fundamentally affects the resulting trouble-free function and performance of the AEG gun. That's why we gave the highest priority and tens of hours of testing and adjustments to the development of the most optimal geometry.

However, the result is a universal geometry solution that gets along with the vast majority of available hop-up rubbers on the global market. Testing was successful with more than 30 types of hop-up rubber bands. The fitting is designed for the trouble-free use and good sealing of AEG hop-up rubber bands with a standard length collar. In the case of using a hop-up elastic band with a longer collar, the enclosed spacers can be used.

Great emphasis is also placed on the quality of production and the quality of the surface, not only of this essential inner part of each hop-up chamber.