This aluminium Hop-up chamber fits all version M870(T.Marui). It also fits the new version (2016) M870 because it has a small centre hole.
This item is manufactured by precision CNC machined and made of aluminium 7075-T6. It:
1) suits all 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.
