EPeS M249 hop-up chamber

The EPES M249 Hop-Up Chamber is a high-end upgrade part designed for M249 / MINIMI airsoft guns. Built for maximum performance, precision and reliability, this CNC-machined hop-up chamber gives your support weapon a more consistent and adjustable hop-up system.

The chamber uses standard AEG hop-up buckings, making it compatible with a wide range of commonly available buckings. Its precisely designed bucking lip seat helps improve air seal and feeding reliability, while the vertically seated pressure bar works especially well with Maple Leaf hop-up buckings.

Hop-up adjustment is handled with a 360° regulator wheel, allowing precise and repeatable tuning. The adjustment direction is clearly marked, making setup easier even during maintenance or field preparation.

The chamber is made from EN AW 7075-T6 aircraft-grade duralumin and finished with a proven H+PTFE surface treatment. This gives the chamber excellent durability, smooth operation and a premium feel. Made in the Czech Republic, this is a serious upgrade for players who want to get the most out of their M249 platform.

Compatibility

• Designed for M249 / MINIMI airsoft guns
• Compatible with A&K, P&J and Classic Army models
• Designed for standard AEG hop-up buckings
• Works especially well with Maple Leaf hop-up buckings

Key features

• High-end CNC-machined hop-up chamber for M249 / MINIMI airsoft guns
• Precise 360° hop-up adjustment wheel
• Clearly marked hop-up adjustment direction
• Designed for AEG hop-up buckings with standard lip length
• Spacer sleeves included for buckings with longer lips
• Vertically seated pressure bar for improved hop-up performance
• Adjustable chamber clearance against the gearbox opening with included O-rings
• Multiple fixation options to help prevent chamber rotation
• Replaceable feed assembly mounting pin
• Made from EN AW 7075-T6 aircraft-grade duralumin
• H+PTFE surface finish
• Made in the Czech Republic

Package contents

• 1 × hop-up chamber
• 1 × hop-up pressure bar regulation ring
• 1 × pressure roller
• 2 × O-rings for securing the regulator ring, 9 × 1.5 mm
• 2 × O-rings for adjusting chamber clearance against the gearbox opening, 6 × 1 mm and 9 × 1 mm
• 2 × spacer sleeves for hop-up bucking lip, 0.1 mm and 0.2 mm
• 4 × grub screws for fixing the inner barrel inside the hop-up chamber, 2 × M3×5 and 2 × M3×4
• 1 × M3×12 grub screw for fixing the hop-up chamber inside the outer barrel housing
• 1 × longer replacement pin for mounting the chamber inside the feed assembly

Please note

Correct installation and alignment are important for reliable feeding, air seal and overall performance. Make sure the chamber is properly seated, the bucking is correctly installed and the BB path is unobstructed before use.