M870 (T.Marui) Hop-up Chamber

This aluminium Hop-up chamber fits the original version M870(T.Marui).  It does NOT fit the new version (2015) M870 loading nozzle because it does not have a small centre hole.  For the new version (2015) M870(T.Marui), you need new version Hop-up chamber (i.e. #4059) together with our Power-up Loading Nozzle (i.e. #4045T, #4045).

This item is manufactured under CNC process and:

1)   suits T.Marui M870;

2)   improves smoothness of loading BB;

3)   increases hop-up performance;

4)   strengthens construction and durability;

Remark: for the best air-tightness in the hop-up chamber and smoothness installation, please put some lubricating grease all around 3 hop-up buckings and barrels inside the hop-up chamber. 

All products are for airsoft only.  They are not made for real steel firearms.