This high tensile steel blow-back housing (BBU) is made by precision CNC machines. It fits Marui Glock 17 Gen.4, Glock 19 Gen.4 and Glock 19 GBB pistols. The dimension is basis of Marui blow-back housing, and it is modified with light weight and Double Ring System for professional and competition needs:
1) increasing the blow-back and recoil speed;
2) increasing gas-tightness with loading nozzle;
3) increasing precisionist and faster repeat shooting (e.g. double/triple tag);
4) ensuring loading nozzle inline with hop-up.
All products are made for airsoft only. They are not made for real steel firearms.
