Begadi Hop-Up Barrel Spring. 21mm/Rainbow color

Begadi running spring / hop-up spring for (S)AEG models. 

This spring is required for many (S)AEG models to press the hop-up unit against the gearbox. 
If a spring that is too weak is installed here, there may be a loss of pressure between the nozzle and the hop-up rubber. 
We offer this spring in two lengths, please check which length is suitable for your weapon. 

This spring is also required for the Retro Arms Gen.2 HopUp Unit, for example. 

Features: 
- Material: spring steel 
- Length: 21mm 
- Inner diameter: 8.7mm 
- Outer diameter: 11mm 
- Smallest length: (Compressed): 6.0mm