OEM replacement hop-up chamber for polymer body Echo 1 M4/M16 variants. Should work with other brands such as JG, Classic Army Sportline, and others that do not use a metal one piece hop-up chamber (typically metal bodied models).
If unsure of compatibility with your AEG, please contact us prior to ordering.
Includes:
- Pre-assembled Upper
- Replacement Bucking and Nub
- Bucking Retainer Ring
- Barrel Retention Clip