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.
